| cactus | (noun) any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines | - |
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| caduceus | (noun) an insignia used by the medical profession; modeled after the staff of Hermes | - |
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| calamus | (noun) the hollow spine of a feather | Synonyms: quill, shaft |
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| (noun) any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes | - |
| (noun) perennial marsh plant having swordlike leaves and aromatic roots | Synonyms: Acorus calamus, flagroot, myrtle flag, sweet calamus, sweet flag |
| (noun) the aromatic root of the sweet flag used medicinally | - |
| calcaneus | (noun) the largest tarsal bone; forms the human heel | Synonyms: heelbone, os tarsi fibulare |
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| calceus | (noun) a shoe covering the ankle; worn by ancient Romans | - |
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| calculus | (noun) the branch of mathematics that is concerned with limits and with the differentiation and integration of functions | Synonyms: infinitesimal calculus |
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| (noun) a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body | Synonyms: concretion |
| (noun) an incrustation that forms on the teeth and gums | Synonyms: tartar, tophus |
| caliculus | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: calycle, calyculus |
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| callousness | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, hardness, insensibility, unfeelingness |
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| callus | (noun) (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid | - |
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| (noun) bony tissue formed during the healing of a fractured bone | - |
| (noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) | Synonyms: callosity |
| calyculus | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: caliculus, calycle |
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| (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calycle, epicalyx, false calyx |
| campus | (noun) a field on which the buildings of a university are situated | - |
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| canaliculus | (noun) a small canal or duct as in some bones and parts of plants | - |
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| canthus | (noun) either of the corners of the eye where the upper and lower eyelids meet | - |
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| capaciousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: commodiousness, roominess, spaciousness |
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| (noun) intellectual breadth | Synonyms: roominess |
| capriciousness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: arbitrariness, flightiness, whimsey, whimsicality, whimsy |
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| (noun) the quality of being guided by sudden unpredictable impulses | Synonyms: unpredictability |
| cardhouse | (noun) an unstable construction with playing cards | Synonyms: card-house, cardcastle, house of cards |
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| carnivorousness | (noun) The quality of being an animal that eats meat as the main part of its diet. | Synonyms: zoophagy |
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| carousal | (noun) revelry in drinking; a merry drinking party | Synonyms: bender, booze-up, carouse, toot |
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| carouse | (noun) revelry in drinking; a merry drinking party | Synonyms: bender, booze-up, carousal, toot |
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| carousel | (noun) a large, rotating machine with seats for children to ride on for amusement | Synonyms: carrousel, merry-go-round, roundabout, whirligig |
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| (noun) a conveyer belt that carries luggage to be claimed by air travelers | Synonyms: carrousel, luggage carousel, luggage carrousel |
| carouser | (noun) someone who enjoys riotous drinking | Synonyms: wassailer |
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| carpus | (noun) a joint between the distal end of the radius and the proximal row of carpal bones | Synonyms: articulatio radiocarpea, radiocarpal joint, wrist, wrist joint |
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| carrousel | (noun) a large, rotating machine with seats for children to ride on for amusement | Synonyms: carousel, merry-go-round, roundabout, whirligig |
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| (noun) a conveyer belt that carries luggage to be claimed by air travelers | Synonyms: carousel, luggage carousel, luggage carrousel |
| catacaustic | (noun) a caustic curve formed by light reflecting from a curved surface. | - |
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| cathouse | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, brothel, house of ill repute, house of prostitution, sporting house, whorehouse |
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| caucus | (noun) a closed political meeting | - |
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| causa | (noun) a comprehensive term for any proceeding in a court of law whereby an individual seeks a legal remedy | Synonyms: case, cause, lawsuit, suit |
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| causalgia | (noun) a burning pain in a limb along the course of a peripheral nerve; usually associated with skin changes | - |
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| causality | (noun) the relation between causes and effects | - |
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| causation | (noun) the act of causing something to happen | Synonyms: causing |
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| cause | (noun) any entity that produces an effect or is responsible for events or results | Synonyms: causal agency, causal agent |
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| (noun) a comprehensive term for any proceeding in a court of law whereby an individual seeks a legal remedy | Synonyms: case, causa, lawsuit, suit |
| (noun) a series of actions advancing a principle or tending toward a particular end | Synonyms: campaign, crusade, drive, effort, movement |
| (noun) a justification for something existing or happening | Synonyms: grounds, reason |
| (noun) events that provide the generative force that is the origin of something | - |
| causerie | (noun) light informal conversation for social occasions | Synonyms: chin-wag, chin-wagging, chin wag, chin wagging, chit-chat, chit chat, chitchat, gab, gabfest, gossip, small talk, tittle-tattle |
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| causeway | (noun) a road that is raised above water or marshland or sand | - |
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| causing | (noun) the act of causing something to happen | Synonyms: causation |
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| caustic | (noun) the envelope of light rays reflected or refracted by a curved surface or object | - |
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| (noun) any chemical substance that burns or destroys living tissue | - |
| cautious | (noun) people who are fearful and cautious | Synonyms: timid |
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| cautiousness | (noun) the trait of being cautious; being attentive to possible danger | Synonyms: carefulness, caution |
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| cayuse | (noun) a small native range horse | Synonyms: Indian pony |
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| census | (noun) a periodic count of the population | Synonyms: nose count, nosecount |
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| ceratodus | (noun) extinct lungfish | - |
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| ceratosaurus | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaur |
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| ceremoniousness | (noun) a ceremonial manner | - |
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| ceruse | (noun) a poisonous white pigment that contains lead | Synonyms: lead carbonate, white lead |
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| cerussite | (noun) a mineral consisting of lead carbonate that is an important source of lead | Synonyms: white lead ore |
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| chapterhouse | (noun) a house used as a residence by a chapter of a fraternity | Synonyms: frat house, fraternity house |
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| (noun) a building attached to a monastery or cathedral; used as a meeting place for the chapter | - |
| charterhouse | (noun) a Carthusian monastery | - |
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| chartreuse | (noun) a shade of green tinged with yellow | Synonyms: Paris green, pea green, yellow green, yellowish green |
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| chauffeuse | (noun) a woman chauffeur | - |
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| chiasmus | (noun) inversion in the second of two parallel phrases | - |
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| chophouse | (noun) a restaurant that specializes in steaks | Synonyms: steakhouse |
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| choragus | (noun) (ancient Greece) leader of a group or festival; leader of a chorus | - |
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| chorus | (noun) the part of a song where a soloist is joined by a group of singers | Synonyms: refrain |
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| (noun) any utterance produced simultaneously by a group | - |
| (noun) a group of people assembled to sing together | - |
| (noun) a body of dancers or singers who perform together | Synonyms: chorus line |
| (noun) a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play | Synonyms: Greek chorus |
| circuitousness | (noun) The state of being roundabout, indirect or not to the point. | - |
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| circus | (noun) a performance given by a traveling company of acrobats, clowns, and trained animals | - |
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| (noun) a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment | Synonyms: carnival |
| (noun) an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent | - |
| (noun) (antiquity) an open-air stadium for chariot races and gladiatorial games | - |
| (noun) a travelling company of entertainers; including trained animals | - |
| cirrhus | (noun) usually coiled | Synonyms: cirrus |
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| cirrocumulus | (noun) a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples | Synonyms: cirrocumulus cloud |
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| cirrostratus | (noun) a thin uniform layer of hazy cloud at high altitude | Synonyms: cirrostratus cloud |
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| cirrus | (noun) a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile | - |
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| (noun) a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles) | Synonyms: cirrus cloud |
| (noun) usually coiled | Synonyms: cirrhus |
| citrus | (noun) any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions | Synonyms: citrous fruit, citrus fruit |
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| (noun) any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds | Synonyms: citrus tree |
| clause | (noun) (grammar) an expression including a subject and predicate functioning as a part of a complex sentence | - |
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| (noun) a separate section of a legal document (as a statute or contract or will) | Synonyms: article |
| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| clavus | (noun) a hard thickening of the skin (especially on the top or sides of the toes) caused by the pressure of ill-fitting shoes | Synonyms: corn |
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| clianthus | (noun) any of various shrubs or vines of the genus Clianthus having compound leaves and pea-like red flowers in drooping racemes | Synonyms: glory pea |
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| clonus | (noun) convulsion characterized by alternating contractions and relaxations | - |
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| clothesbrush | (noun) a brush used for cleaning clothing | - |
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| clubhouse | (noun) a building that is occupied by a social club | Synonyms: club |
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| clusia | (noun) an aromatic tree of the genus Clusia having large white or yellow or pink flowers | - |
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| cluster | (noun) a grouping of a number of similar things | Synonyms: bunch, clump, clustering |
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| clusterfuck | (noun) A chaotic situation where everything seems to go wrong | - |
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| clustering | (noun) a grouping of a number of similar things | Synonyms: bunch, clump, cluster |
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| clypeus | (noun) a shield-like plate on the front of an insect's head | - |
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| coccobacillus | (noun) a bacterial cell intermediate in morphology between a coccus and a bacillus; a very short bacillus | - |
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| coccus | (noun) any spherical or nearly spherical bacteria | Synonyms: cocci |
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| cocuswood | (noun) wood of the granadilla tree used for making musical instruments especially clarinets | Synonyms: cocoswood, granadilla wood |
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| coffeehouse | (noun) a small restaurant where drinks and snacks are sold | Synonyms: cafe, coffee bar, coffee shop |
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| coiffeuse | (noun) a woman hairdresser | - |
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| coitus | (noun) sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur | Synonyms: carnal knowledge, coition, copulation, intercourse, relation, sex act, sexual congress, sexual intercourse, sexual relation |
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| coleus | (noun) any of various Old World tropical plants of the genus Coleus having multicolored decorative leaves and spikes of blue flowers | Synonyms: flame nettle |
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| collusion | (noun) secret agreement | - |
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| (noun) agreement on a secret plot | Synonyms: connivance |
| colobus | (noun) arboreal monkey of western and central Africa with long silky fur and reduced thumbs | Synonyms: colobus monkey |
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| colossus | (noun) someone that is abnormally large and powerful | Synonyms: behemoth, giant, goliath, monster |
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| (noun) a person of exceptional importance and reputation | Synonyms: behemoth, giant, heavyweight, titan |
| combustibility | (noun) the quality of being capable of igniting and burning | Synonyms: burnability, combustibleness |
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| combustible | (noun) a substance that can be burned to provide heat or power | Synonyms: combustible material |
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| combustibleness | (noun) the quality of being capable of igniting and burning | Synonyms: burnability, combustibility |
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| combustion | (noun) the act of burning something | Synonyms: burning |
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| (noun) a process in which a substance reacts with oxygen to give heat and light | Synonyms: burning |
| (noun) a state of violent disturbance and excitement | - |
| commodiousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, roominess, spaciousness |
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| compsognathus | (noun) very small bipedal carnivorous dinosaur of the late Jurassic in Bavaria | - |
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| conceptus | (noun) an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life | Synonyms: embryo, fertilized egg |
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| conclusion | (noun) the act of ending something | Synonyms: ending, termination |
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| (noun) the act of making up your mind about something | Synonyms: decision, determination |
| (noun) a position or opinion or judgment reached after consideration | Synonyms: decision, determination |
| (noun) an intuitive assumption | - |
| (noun) the last section of a communication | Synonyms: close, closing, end, ending |
| (noun) the proposition arrived at by logical reasoning (such as the proposition that must follow from the major and minor premises of a syllogism) | Synonyms: ratiocination |
| (noun) a final settlement | - |
| (noun) event whose occurrence ends something | Synonyms: ending, finish |
| (noun) the temporal end; the concluding time | Synonyms: close, finale, finis, finish, last, stopping point |
| conclusiveness | (noun) the quality of being final or definitely settled | Synonyms: decisiveness, finality |
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| concussion | (noun) injury to the brain caused by a blow; usually resulting in loss of consciousness | - |
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| (noun) any violent blow | - |
| confusedness | (noun) a mental state characterized by a lack of clear and orderly thought and behavior | Synonyms: confusion, disarray, mental confusion, muddiness |
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| confusion | (noun) a mistake that results from taking one thing to be another | Synonyms: mix-up |
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| (noun) an act causing a disorderly combination of elements with identities lost and distinctions blended | - |
| (noun) a mental state characterized by a lack of clear and orderly thought and behavior | Synonyms: confusedness, disarray, mental confusion, muddiness |
| (noun) a feeling of embarrassment that leaves you confused | Synonyms: discombobulation |
| (noun) disorder resulting from a failure to behave predictably | - |
| congius | (noun) a British imperial capacity measure (liquid or dry) equal to 4 quarts or 4.545 liters | Synonyms: gallon, Imperial gallon |
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| congruousness | (noun) the quality of agreeing; being suitable and appropriate | Synonyms: congruence, congruity |
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| conscientiousness | (noun) the quality of being in accord with the dictates of conscience | - |
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| (noun) the trait of being painstaking and careful | Synonyms: painstakingness |
| consciousness | (noun) an alert cognitive state in which you are aware of yourself and your situation | - |
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| (noun) having knowledge of | Synonyms: awareness, cognisance, cognizance, knowingness |
| consensus | (noun) agreement in the judgment or opinion reached by a group as a whole | - |
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