- General Overview
- Memory's Design and the Paradox
- Central thesis: Memory is a fallible, selective reconstruction, not a recording; forgetting is normal and healthy.
- Penny paradox: Routine details vanish because brains evolved to discard the predictable; failing to draw a penny is proof of design.
- Memory anxiety: Forgetfulness triggers fear of Alzheimer's, but most lapses are factory settings, not disease.
- Owner's manual: Understanding memory mechanics reduces fear and empowers better recall.
- Memory is king: It powers learning, daily life, and identity—yet must be held lightly.
- How Memories Are Made
- Four steps: encoding, consolidation, storage, retrieval; attention is the gateway.
- Hippocampus: binds fragments into unified memories; damage blocks new consolidation.
- Distributed storage: traces live across the brain regions that processed the experience.
- Working memory: brief 15–30 second holding space; chunking expands capacity.
- Retrieval: reconstructive scavenger hunt that rewrites the memory each time.
- The Three Memory Systems
- Muscle memory: skills live in basal ganglia and cerebellum; repetition builds automated patterns.
- Semantic memory: timeless facts—your brain's Wikipedia, strengthened by spacing and self-testing.
- Episodic memory: where-and-when life events, driven by emotion, meaning, and novelty.
- Prospective memory: future intentions are unreliable without cues, lists, and implementation intentions.
- Memory's Fallibility
- Reconstruction: every recall re-saves an edited version; false memories can be planted.
- Language shapes memory: "smashed" versus "contacted" changes remembered speed and details.
- Eyewitness limits: vivid confidence doesn't equal accuracy; DNA exonerations show false memory.
- Flashbulb memories: shocking events feel certain but erode over time.
- Tip of the tongue: a blocking problem, not loss; names are hard because they are abstract cul-de-sacs.
- Forgetting Is Functional
- Ebbinghaus curve: unsupported memory drops sharply, then levels; repetition and meaning resist decay.
- Fuggedaboutit: discarding outdated details prevents interference; S. the mnemonist was burdened by total recall.
- Therapy for trauma: retrieval avoidance and reconsolidation rewrite painful memories.
- Aging, Alzheimer's, and Prevention
- Normal aging: recall and processing slow, but semantic knowledge and recognition stay strong.
- Alzheimer's: amyloid plaques, tangles, and hippocampal death cause catastrophic recent-memory loss.
- Prevention: Mediterranean/MIND diets, exercise, sleep, and cognitive reserve cut risk; brain games don't.
- Lifestyle levers: stress reduction, sleep, and heart health protect memory and lower dementia risk.
- Enhancing Memory and the Paradox Resolved
- Context and state: retrieval matches encoding conditions; the doorway effect strips cues.
- Stress and sleep: moderate stress aids encoding, chronic stress harms; sleep consolidates and cleans the brain.
- Practical toolkit: attention, meaning, novelty, visualization, memory palaces, spaced testing, and external cues.
- Take it seriously, hold it lightly: value memory's power yet forgive its lapses; identity and love outlast memory loss.
- Memory's Design and the Paradox
- Deep Dive
- Introduction
- The Penny Paradox
- Penny test: Seeing a penny hundreds of times doesn’t mean you can draw it accurately.
- Memory’s design: Brains evolved to discard routine details; failing the penny test is healthy.
- Memory is king: It powers learning, daily tasks, and the narrative identity of your life.
- The Economics of Remembering and Forgetting
- Meaning filter: Significant events stick; habitual, inconsequential moments are forgotten.
- Normal forgetting: Losing the tenth kiss, last week’s laundry, or your lunch is not a defect.
- Flashbulb memories: Vivid recollections of shocks like 9/11 feel certain but are often inaccurate.
- Caring forgetfulness: Missing overdue library books happens when attention never created a memory.
- Fear and Empowerment
- Memory anxiety: Forgetfulness triggers fears of Alzheimer’s, aging, and losing yourself.
- Factory settings: Imperfection is normal; most memory failures aren’t disease or character flaws.
- Owner’s manual: Understanding memory mechanics protects against forgetful episodes and reduces fear.
- A Field Guide to Memory
- Memory flavors: Present, skill, knowledge, event, and intention memories operate differently.
- Attention gateway: No attention means no memory formed—you didn’t forget where you parked.
- Access vs erasure: Some lost items surface with cues; others are gone forever.
- Shaping forces: Meaning, emotion, sleep, stress, and context determine what endures.
- The Penny Paradox
- Part I: How We Remember
- Chapters 1–3
- Making Memories 101
- Memory: a lasting physical change in the brain, formed from linked neural activity.
- Four steps: encoding, consolidation, storage, retrieval—all required for conscious recall.
- Hippocampus: seahorse-shaped weaver that binds sensory, emotional, and factual fragments into one memory.
- Hippocampal damage: disrupts new memory consolidation; Alzheimer’s begins here, causing repetition and recent forgetfulness.
- Storage: memories live distributed across the brain regions that processed the experience, not in a memory bank.
- Retrieval: a reconstructive scavenger hunt; activating one cue triggers the linked circuit.
- Pay Attention
- Attention: the essential first ingredient; perception without attention creates no lasting memory.
- Memory is not a video camera: only what you notice is encoded, so routine exposures like bridges or pennies vanish.
- Forgetting names or keys: usually absence of attention at encoding, not a true memory failure.
- Meaning drives encoding: we remember what is new, surprising, emotional, consequential, or useful.
- Divided attention: multitasking weakens memory formation and later retrieval.
- Mindful focus: what you attend to shapes your remembered life; look for magic to store it.
- In the Moment
- Working memory: a brief prefrontal holding space for the present moment, lasting about fifteen to thirty seconds.
- Capacity: seven plus or minus two items; chunking expands what you can hold.
- Phonological loop: auditory echo holds about two seconds of speech; long, multisyllabic words fade faster.
- Visuospatial scratchpad: visual working memory, equally temporary and limited.
- Gateway to long-term memory: meaningful or emotional details are shuttled to the hippocampus for consolidation.
- Without a hippocampus: working memory still works, but nothing persists beyond the present moment.
- Making Memories 101
- Chapters 4–5
- Muscle Memory
- Muscle memory is a misnomer: skills are stored and activated in the brain, not the muscles.
- Long-term memory has three types: semantic facts, episodic events, and procedural skills such as skiing or typing.
- Skill consolidation uses the basal ganglia and cerebellum, not the hippocampus; Molaison could still learn mirror-drawing.
- Repetition binds separate movements into one automated pattern; focused practice enlarges motor cortex maps for that skill.
- Ten-thousand-hour rule from Outliers is not magical; prior training counts, but focused repetition remains essential.
- Unconscious retrieval of skills frees conscious attention for thinking, imagining, and deciding.
- Your Brain’s Wikipedia
- Semantic memory stores facts and personal data, timeless and detached from any specific learning moment.
- Episodic memory stores life events with where and when; semantic feels like knowing, episodic feels like remembering.
- Spacing effect: distributed practice beats cramming because the hippocampus gets more time to consolidate learning.
- Self-testing strengthens memory by retrieval; tested learners recalled 80% versus 35% in the Swahili study.
- Meaning matters: taxi drivers and chess masters lose their advantage when routes or positions become random.
- Memory palace: attach list items to familiar visual locations, tapping the brain’s evolved spatial memory.
- Muscle Memory
- 6. What Happened
- The Anatomy of Episodic Memory
- Episodic memory: the where-and-when record of life’s experiences; time travel to your past.
- Routine fades: habitual meals, commutes, and chores rarely survive beyond the present moment.
- Attention gates memory: we cannot remember what we habitually ignore or never notice.
- Fallible record: however vivid, your memories for what happened are wrong.
- What Makes an Experience Stick
- Emotion and surprise: amygdala fires; hippocampus consolidates context into lasting memory.
- Meaning matters: special days like Thanksgiving outlast ordinary Thursdays even if more recent.
- Flashbulb memories: shocking, personally significant events yield vivid, enduring episodic detail.
- Personal connection is key: distant news fades; hometown tragedies become flashbulbs.
- The Life Story and Its Gaps
- Autobiographical memory: meaningful episodes form a highlights reel that defines identity.
- Memory confirms self-image: we retain stories that fit our outlook, forgetting those that don’t.
- Childhood amnesia: almost nothing before age three; language builds the narrative.
- Recency and bump: recent years are easiest, but most episodic memories cluster between ages fifteen and thirty.
- Exceptional Rememberers
- HSAM: rare people recall nearly every day from late childhood, mundane or extraordinary.
- Organized by date: retrieval feels like a timeline of chunks, not visual scenes.
- Isolated superpower: faces, phone numbers, and daily tasks remain ordinary.
- Double-edged gift: some HSAM holders feel cursed by unrelenting recall of pain.
- Everyday Retention Strategies
- Break routine: novelty, travel, and celebration turn ho-hum days into memorable ones.
- Look up and feel: screens steal attention; emotion deepens encoding.
- Rehash and journal: rehearsal and diary cues—Wagenaar recalled 80% of 2,402 events.
- External cues: social media, photos, and life-logging technologies trigger and reinforce recall.
- The Anatomy of Episodic Memory
- Chapters 1–3
- Part II: Why We Forget
- Chapters 7–8
- 7. Your Memories (For What Happened) Are Wrong
- Episodic memory is inherently fallible: every stage—encoding, consolidation, storage, retrieval—introduces distortions and omissions.
- Encoding is selective: we capture only details our biases and attention select, so no memory holds the full truth.
- Consolidation edits the recipe: imagination, opinion, dreams, photos, and suggestion can alter memories before storage.
- Retrieval rewrites memory: recalling reconstructs the story and then re-saves a changed version, like hitting save on edits.
- False memories can be planted: leading questions convinced 25–50% of people they remembered fictional events like a hot-air balloon ride.
- Misleading language contaminates recall: verbs like “smashed” versus “contacted” shifted remembered speed and even created broken-glass memories.
- Eyewitness testimony is unreliable: nearly 75% of DNA exonerations involved false eyewitness memories; lineups can produce wrong identifications.
- Talking and writing shrink memory: retelling narrows the details, and unmentioned details fade from later recall.
- Confabulation fills gaps: details from others’ stories slip into your memory and come to feel like your own experience.
- Flashbulb memories are not accurate: vivid confidence doesn’t protect Challenger memories; after 2.5 years, 25% of students scored zero accuracy.
- Confidence is no guarantee: trustworthy feelings can accompany entirely false memories, even when contradicted by one’s own handwriting.
- 8. Tip of the Tongue
- TOT is blocking, not loss: the word is stored but temporarily inaccessible, often due to weak or partial neural activation.
- Partial retrieval offers hints: first letter, syllable count, or grammatical gender feel close but can lead to “ugly sister” decoys.
- Ugly sisters hijack recall: a related word diverts attention down the wrong neural path, keeping the target word blocked.
- TOTs are normal and age-related: younger adults experience several weekly; frequency rises with slower processing, not necessarily disease.
- TOT is not Alzheimer's: dementia worries amplify alarm, but blocking alone doesn’t signal pathology.
- Googling is fine: outsourcing retrieval neither weakens memory nor earns a badge; don’t be a memory martyr.
- Baker/baker paradox: common words have rich associations; proper names are abstract cul-de-sacs and thus harder to recall.
- Turn names into images: connect “Sarah Green” to vivid visual cues like Sarah Jessica Parker with a stethoscope on a sheep.
- Recognition beats recall: you’ll instantly know the right answer when offered, so the TOT’s “knowing” feeling is trustworthy.
- 7. Your Memories (For What Happened) Are Wrong
- Chapters 9–11
- Don't Forget to Remember
- Prospective memory: memory for future intentions; unreliable without external cues and attention.
- Cues: time-based or event-based triggers; weak cues cause absentminded forgetting.
- Failures are human: cellists forgetting priceless cellos and surgeons leaving instruments show cue dependence, not character.
- To-do lists: glasses for prospective memory; create and actually check them.
- Calendar & implementation intentions: externalize future tasks; specify “yoga at noon” with a visible cue.
- Physical cues: pillboxes, items near the front door, and routine-disruption checks prevent lapses.
- This Too Shall Pass
- Ebbinghaus forgetting curve: unsupported memory drops steeply, then levels off; about 25% remains after 24 hours.
- Memory decay: without activation, synaptic connections can be pruned; some traces persist via savings.
- Repetition: rehearse to overlearning—100% accuracy, then keep studying—to resist time.
- Meaning: personal significance and stories make memories stick; mundane days fade fast.
- Time heals: leaving painful memories alone lets emotional details erode.
- Fuggedaboutit
- Forgetting is functional: discarding outdated details like hotel rooms and parking spots prevents interference.
- S. the mnemonist: inability to forget burdened him; filtering is essential for daily life.
- Intentional forgetting: redirect attention, avoid encoding, and selectively consolidate positive self-views.
- Retrieval avoidance: don’t rehearse unwanted memories; leaving them alone weakens them.
- Reconsolidation therapy: revisit trauma with a therapist and rewrite version 2.0 without fear-inducing details.
- Self-instruction & visualization: “Let it go” and chalkboard-erasing imagery can erase memories; practice rewrites muscle memory.
- Don't Forget to Remember
- Chapters 12–13
- Normal Aging
- Aging memory: normal forgetting increases, but not every memory system declines equally.
- Stable abilities: muscle memory endures; semantic knowledge and recognition stay strong with age.
- Declining abilities: free recall, TOTs, episodic recall, working memory, attention, and processing speed all normally fade.
- Positivity bias: older adults increasingly recall positive over negative, despite recognizing both.
- Lifestyle limits: healthy diet, sleep, exercise, and meditation help, but can’t fully prevent aging’s toll.
- Mental activity: brain games and puzzles don’t protect normal recall; memory strategies still improve function.
- Alzheimer’s
- Alzheimer’s dementia: progressive synapse blockage and neuron death cause catastrophic memory loss, not normal aging.
- Amyloid plaques: accumulate silently for 15–20 years; a tipping point ignites tangles, inflammation, and cell death.
- Hippocampal onset: first symptom is rapid forgetting of minutes or hours ago; old consolidated memories remain temporarily.
- Word retrieval: TOTs become constant, affecting common words and letters, not just names; cues and Google help.
- Brain spread: parietal, frontal, limbic, and motor regions fall, producing getting lost, poor decisions, mood dysregulation, and lost skills.
- Everyday clues: recognizing your keys later suggests normal absentmindedness; forgetting what keys are for signals disease.
- Normal Aging
- Chapters 7–8
- Part III: Improve or Impair
- Chapters 14–17
- Put It in Context
- Context-dependent memory: Recall is easier and faster when retrieval conditions match the original encoding context.
- The doorway effect: A new room strips away cues, so return to the original room—or picture it—to recover your intention.
- Context is internal too: Mood, stress, tiredness, caffeine, and even language become part of a memory and can trigger it.
- State-matching for tests: Study and take exams under similar conditions, including snacks, music, and alertness.
- Stressed Out
- Acute stress boosts encoding: Adrenaline and cortisol signal the hippocampus to consolidate central details of the stressful event.
- Central focus, peripheral loss: Stress narrows attention, so you remember the core threat but miss surrounding details.
- Acute stress blocks retrieval: Cortisol jams access to already stored memories, explaining test-day mind blanks.
- Inverted-U rule: Moderate stress enhances memory formation; too little or too much impairs it.
- Chronic stress shrinks the hippocampus: Sustained cortisol inhibits neurogenesis and raises Alzheimer’s risk; meditation, exercise, and mindfulness counter it.
- Go to Sleep
- Sleep consolidates memory: Neural replay during sleep strengthens episodic, semantic, and muscle memories.
- Sleep beats time alone: A night’s sleep improves recall by 20–40 percent over an equal period awake.
- Naps free memory space: Even 20 minutes boosts retention and clears hippocampal capacity for new learning.
- Deep sleep cleans the brain: Glial cells flush amyloid and tau; chronic sleep loss accelerates Alzheimer’s risk.
- Seven to nine hours required: Less impairs attention, memory, health, and resilience to dementia.
- Alzheimer’s Prevention
- Lifestyle matters: Only 2 percent of Alzheimer’s is purely inherited; most risk is shaped by how we live.
- Brain-healthy diets: Mediterranean and MIND diets cut Alzheimer’s risk by a third to a half.
- Unproven fixes: Red wine, chocolate, coconut oil, and ginkgo lack convincing evidence; coffee and vitamin D show promise.
- What helps the heart helps the brain: Exercise, HDL cholesterol, blood pressure control, and sleep reduce dementia risk.
- Build cognitive reserve: Learning rich, meaningful new skills creates redundant synapses; crossword puzzles alone don’t protect.
- Life after diagnosis: Emotional memory and the capacity for love remain, even when names and facts fade.
- Put It in Context
- 18. The Memory Paradox
- The Paradox Itself
- Memory's dual nature: essential superpower for every function, yet flaky, incomplete, and confabulates.
- Hold both truths: memory is everything and nothing; take it seriously but hold it lightly.
- Taking It Seriously
- Value memory: appreciating its power and using tools unlocks unlimited potential—languages, music, tests.
- Gratitude payoff: valuing memory boosts happiness and well-being.
- Holding It Lightly
- Forgive imperfection: forgotten names, meals, and library books are ordinary, not failures.
- Stop the blame: fighting memory lapses creates chronic stress; acceptance protects memory and well-being.
- Disagreements fade: family disputes about past details are often both wrong—let them go.
- Exceptional Memory Isn't Everything
- World-class forgetters: Haraguchi forgot his wife's birthday; Yo-Yo Ma left his cello in a taxi.
- No immunity: trained memory doesn't prevent loss, disappointment, or failure, nor guarantee happiness.
- Routine is forgettable: brains discard predictable details; remembering every shower would not improve life.
- Memory and Identity
- Meaningful memories matter: they build self, life narrative, and connection—not total recall.
- Alzheimer's doesn't erase humanity: Greg O'Brien kept humor, faith, presence, and loving relationships despite memory loss.
- Love outlasts memory: his grandmother forgot everyone yet knew she was loved; love needs no recollection.
- The Paradox Itself
- Chapters 14–17
- Appendix: What to Do About It All
- Attention, Meaning, and Novelty
- Attention first: You can’t remember what you never attended to; put down your phone, stop multitasking, be present.
- Meaning is king: We remember what matters to us, so link new information to what you care about.
- Make it about you: Self-relevant details stick; connect new facts to your own history, opinions, and experiences.
- Mix it up: Sameness is forgettable; novelty and distinctive experiences are more likely to be consolidated.
- Visual and Spatial Memory
- See it: Add a mental image or visual note to deepen neural connections and strengthen recall.
- Use imagination: Bizarre, surprising, vivid, or physically impossible images are especially memorable.
- Place it in space: Set images in familiar locations; memory palaces harness your brain’s spatial wiring.
- Remember names visually: Turn a person’s name into a concrete image — Baker becomes a baker.
- Emotion, Story, and Personal Relevance
- Look for drama: Emotion and surprise activate the amygdala and signal your hippocampus to consolidate the experience.
- Tell stories: Stories are meaningful, and retelling them rehearses and reinforces the underlying memory.
- Star in it: Processing new information through personal associations gives you richer cues and deeper encoding.
- Practice, Retrieval, and Context
- Space it out: Spaced practice and overlearning beat cramming for lasting semantic memory.
- Test yourself: Quizzing strengthens retention far more than rereading does.
- Use strong cues: Create multiple pathways to each memory; smell is an especially powerful trigger.
- Match the context: Retrieval works best when internal and external conditions resemble the original learning setting.
- Lifestyle and Emotional Health
- Chill out: Chronic stress impairs memory and shrinks the hippocampus; build resilience through meditation, gratitude, and exercise.
- Sleep enough: Seven to nine hours is essential for consolidating new memories and reducing Alzheimer’s risk.
- Stay positive: Believing you have a terrible memory can become a self-fulfilling prophecy.
- Externalization and Technology
- Offload intentions: Lists, calendars, pillboxes, and sticky notes compensate for our inherently unreliable prospective memory.
- Use your phone: Augmenting memory with technology doesn’t make you dumber — it’s like wearing eyeglasses.
- Preserve the past: Photos, geolocation, captions, and calendar entries help you reconstruct episodic memories accurately.
- Attention, Meaning, and Novelty
- Suggested Reading
- Foundations of Memory Science
- Ebbinghaus's Memory (1885): pioneering experiments on forgetting curves
- Baddeley's Working Memory: the multicomponent model, refined in 2012
- Miller's magical number 7±2: classic limit on immediate memory capacity
- Peterson & Peterson and Brown: decay-theory tests of short-term retention
- Patient H.M. and the Amnesic Brain
- Corkin's Permanent Present Tense: definitive account of patient H.M.
- Dittrich's Patient H.M.: biographical portrait of the man behind the science
- MacKay's Remembering: distills 50 years of H.M. research insights
- Squire & Kandel's Memory: bridges cognition and molecular mechanisms
- False Memory and Reconstruction
- Loftus & Palmer's car-crash studies: wording of questions reshapes recollection
- Loftus & Pickrell: implanting entirely false childhood memories
- Schacter's Seven Sins of Memory: taxonomy of memory's predictable failures
- Schmolck et al.: O.J. Simpson recollections distort over time
- Shaw's The Memory Illusion: applied science of false memory
- Emotion, Flashbulb Memory, and Attention
- Hirst et al. 9/11 studies: flashbulb memories vivid but event details fade
- Winograd & Neisser: accuracy of flashbulb memories questioned
- McGaugh's Memory and Emotion: emotion strengthens lasting memories
- Blake et al. : most people cannot identify the Apple logo from memory
- Aging, Dementia, and Prevention
- Salthouse's processing-speed theory: cognitive aging driven by slower processing
- Snowdon's Nun Study: links early-life factors to dementia outcomes
- FINGER trial (Kivipelto): multidomain lifestyle intervention prevents decline
- Johansson and Wilson: psychological distress raises dementia risk
- Mantyla & Nilsson and Neupert: prospective memory failures in daily aging
- Sleep, Retrieval, and Memory Enhancement
- Walker's Why We Sleep: sleep-dependent consolidation research
- Karpicke & Roediger: retrieval practice beats re-studying for learning
- Godden & Baddeley: context-dependent memory in divers
- Foer's Moonwalking with Einstein: mnemonic techniques demystified
- Melby-Lervag & Hulme: no evidence for working-memory training benefits
- Foundations of Memory Science
- Acknowledgments
- Introduction
- Core Conclusion and Practical Takeaways
- Core Truths
- Memory's purpose: not to record everything but to retain what matters; forgetting routine details is healthy.
- Attention gates memory: no attention, no memory; forgetting names or keys usually means you never encoded them.
- Memory is reconstructive: every recall rewrites the story; vividness and confidence don't guarantee accuracy.
- Forgetting is functional: discarding old facts and routines prevents interference and clears space for what matters.
- Memory types differ: skills, facts, events, and intentions each need distinct strategies and follow different rules.
- Everyday Practices
- Pay attention first: put down the phone, stop multitasking, and be present to create memories at encoding.
- Make it meaningful: link new information to personal experience, emotion, or story — meaning is the strongest glue.
- Space and test: distribute practice over time and quiz yourself; retrieval beats rereading for lasting memory.
- Use mental images: make names and facts concrete, bizarre, or spatial; memory palaces harness evolved spatial memory.
- Rehearse and journal: retelling and diary cues preserve episodic detail; Wagenaar recalled 80% of 2,400 events.
- Offloading and Cues
- Externalize intentions: calendars, lists, pillboxes, and sticky notes compensate for unreliable prospective memory.
- Use your phone as glasses: technology that augments memory doesn't make you dumb; it's a legitimate tool.
- Match context: recall is easier when retrieval conditions resemble encoding, including mood, place, and state.
- Set physical cues: leave items by the door, use routine disruptions, and place reminders where you'll see them.
- Break routine for memory: novelty, travel, and celebration turn ordinary days into memorable episodic moments.
- Lifestyle and Protection
- Sleep seven to nine hours: nights and naps consolidate memory; deep sleep flushes amyloid and tau.
- Manage stress: acute stress blocks retrieval; chronic stress shrinks the hippocampus — meditate, move, and breathe.
- Exercise and eat Mediterranean: heart-healthy habits cut Alzheimer's risk by a third to a half.
- Build cognitive reserve: learn rich, meaningful new skills; crossword puzzles and brain games don't protect recall.
- Use cues to defuse TOTs: first letters, context, and Googling are fine; blocking is normal, not Alzheimer's.
- Mindset Shifts
- Forgive normal forgetting: missed meals, library books, and names are ordinary failures, not character flaws.
- Hold memory lightly: take memory seriously as a tool, but don't demand perfection from a reconstructive process.
- Let go of blame: fighting lapses creates stress that impairs memory; acceptance protects it.
- Don't fear Alzheimer's prematurely: daily forgetting with recognition later is normal; forgetting what objects are for is the warning sign.
- Love outlasts memory: even with advanced dementia, emotional connection and humanity remain; identity is more than recall.
- Core Truths
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