RxSwift in Practice - Speaker Deck

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3Y4XJGUJO1SBDUJDF J04Φʔϧελʔζ .PUPLJ/BSJUB !NPUPLJFF

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ࣗݾ঺հ w !NPUPLJFF w J04ΤϯδχΞ w ϝϧΧϦΞοςͷJ04Λ։ൃ w ωΫετʢ)0.&`4ʣˠι΢κ΢ʢ೥݄ʣ w ݸਓͰ΋झຯͰJ04ΞϓϦΛ։ൃ w J04%$+BQBOίΞελοϑ

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3Y4XJGU࢖͍ͬͯ·͔͢

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ϝϧΧϦΞος͸શ໘తʹ 3Y4XJGUΛ࠾༻ͯ͠։ൃ

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Ξος։ൃͷٕज़ɿ4XJGUͱ3Y4XJGUCZ4IJOJDIJSP0CB IUUQTTQFBLFSEFDLDPNCSJDLMJGFBUVUFLBJGBGBMTFKJTIVTXJGUUPSYTXJGU

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͍͍ͩͨ4XJGUͰॻ͔Ε͍ͯΔ ˞0CKFDUJWF$͸ϥΠϒϥϦͳͲ

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൒೥લʜ

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ձࣾʢલ৬ʣͰ3Y4XJGUษڧձ w ౰࣌ͳΜͱͳ͘ྲྀߦ͍ͬͯͨ w ࣾ಺ͷ༗ࢤͰʢۀ຿֎ʣ w ຖि݄༵ேʢʙʣʹू·ͬͯษڧձ w 1MBZHSPVOEͰجຊతͳΦϖϨʔλΛֶͿ w &YBNQMFTΛݟΔ

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ճ͘Β͍΍ͬͯΈͨײ૝ w ࣮ફతͳίʔυΛॻ͍ͯਐΊͨํ͕ྑͦ͞͏ w ந৅౓͕ߴ͘ɺͳΜͷͨΊʹ3Y4XJGUΛ࢖͏ͷ͔ɺԿ͕ྑ ͘ͳΔͷ͔ɺཧղͰ͖͍ͯͳ͔ͬͨ w ϝϯόʔʹ΋ཧղͯ͠໯͏ඞཁ͕͋Γͦ͏

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ʮผʹಋೖ͠ͳͯ͘΋͍͍͔ʯ ͱࢥͬͨ൒೥ޙʜ

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స৬ͯ͠3Y4XJGUΛϑϧͰ࢖͏͜ͱʹ

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ຊ֨తʹ3Y4XJGUͰ։ൃΛ࢝Ίͯϲ݄ͷ φϚͷ੠Λ͓ಧ͚͠·͢

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3Y4XJGUʹ͍ͭͯ

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3Y4XJGU w ϦΞΫςΟϒϓϩάϥϛϯάΛ4XJGUͰॻͨ͘Ίͷ  ϥΠϒϥϦ w ϚΠΫϩιϑτ͕/&5'SBNFXPSLʹ޲͚ʹ  ϦϦʔεͨ͠3FBDUJWF&YUFOTJPOTʢ3YʣϥΠϒϥϦ Ͱ͋Δ3Y/&5 Ҿ༻IUUQXXXCVJMEJOTJEFSOFUDPMVNOLBXBJZPTIJGVNJ ͔Β೿ੜ w 4XJGUҎ֎ʹ΋3Y+BWBɺ3Y+4ͳͲͷ༷ʑͳݴޠʹ  ೿ੜ

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Ξος։ൃͷٕज़ɿ4XJGUͱ3Y4XJGUCZ4IJOJDIJSP0CB IUUQTTQFBLFSEFDLDPNCSJDLMJGFBUVUFLBJGBGBMTFKJTIVTXJGUUPSYTXJGU

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ετϦʔϜ઒

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ετϦʔϜΛͲ͏ѻ͏͔ʁ ࡞ΔՃ޻؂ࢹ

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;Ή;Ήɺ;Ή;Ήɻ ετϦʔϜΛ࡞ΔՃ޻͢Δ؂ࢹ͢Δͱ͍͏ࢹ఺Ͱ ϓϩάϥϛϯάΛߦ͏ͱɻ

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ͳΔ΄ͲɺͳΔ΄Ͳɻ ετϦʔϜΛ࡞ΔՃ޻͢Δ؂ࢹ͢Δͱ͍͏ࢹ఺Ͱ ϓϩάϥϛϯάΛߦ͏ɻͳΔ΄ͲͰ͢Ͷʙɻ

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ͳΔ΄Ͳɺ·ͬͨ͘Θ͔ΒΜ

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Ͳ͏͍͏͜ͱʁ w ετϦʔϜΛ࡞Δʁ w ετϦʔϜΛՃ޻͢Δʁ w ετϦʔϜΛ؂ࢹ͢Δʁ

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ݱ৔ͰͲͷΑ͏ʹ࢖͍ͬͯΔͷ͔ʁ ઃܭʹͲͷΑ͏ʹӨڹΛ༩͍͑ͯΔͷ͔ʁ

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͍·͋ΔॲཧΛͲͷΑ͏ʹ ॻ͖׵͑ΒΕΔͷ͔ʁ

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࣮ࡍʹϦϦʔε͞Ε͍ͯΔɺ ͋ΔΧϝϥΞϓϦͷ࣮૷Λ3Yʹॻ͖׵͑ͯΈΔ

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͋ΔΧϝϥΞϓϦʹ͍ͭͯ w ڈ೥࡞ͬͨࣗ෼ͷΞϓϦ w Χϝϥ͔Βͷೖྗө૾ʹϑΟϧλʔΛ͔͚ͯϦΞϧ λΠϜͰϓϨϏϡʔͰ͖Δ w ࡱӨ͢ΔͱϑΟϧλʔՃ޻͞Εͨঢ়ଶͷը૾͕อଘ ͞ΕΔ

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Ϙλϯλοϓ ϩʔσΟϯάදࣔɺ  ɹը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾อଘޙɺϩʔσΟϯάΛ  ɹඇදࣔʹͯ͠ϑΟϧλʔΛมߋ

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௨ৗͷ࣮૷ Ϙλϯ͕ԡ͞ΕͨࡍʹҎԼͷ ॲཧΛߦ͏ϝιου࡞Δ ը૾ΛΩϟϓνϟͯ͠อଘ͢Δ ͕ऴྃͨ͠ΒϩʔσΟϯάඇ දࣔ ͱಉ࣌ʹϑΟϧλʔΛมߋ Ϙλϯλοϓ Ϙλϯλοϓޙɺ  ը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾Λอଘ͞ΕΔ·Ͱ  ϩʔσΟϯάදࣔ ը૾อଘޙʹ  ϑΟϧλʔΛมߋ

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࣮ࡍͷίʔυ Λ ͔ͳΓϚγʹͨ͠΋ͷ

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Ϙλϯ͕ԡ͞ΕͨΒϩʔσΟϯάදࣔ ࣮ࡍͷίʔυ Λ ͔ͳΓϚγʹͨ͠΋ͷ

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Ωϟϓνϟ ࣮ࡍͷίʔυ Λ ͔ͳΓϚγʹͨ͠΋ͷ

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࣮ࡍͷίʔυ Λ ͔ͳΓϚγʹͨ͠΋ͷ Ωϟϓνϟऴྃޙɺ੒ޭͰ͋Ε͹ϩʔσΟϯάඇදࣔɺΤϑΣΫτΛมߋ

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࣮ࡍͷίʔυ Λ ͔ͳΓϚγʹͨ͠΋ͷ ΩϟϓνϟͰ͖ͳ͔ͬͨ৔߹͸Τϥʔදࣔ

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௨ৗͷ࣮૷ Ϙλϯλοϓ Ϙλϯλοϓޙɺ  ը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾Λอଘ͞ΕΔ·Ͱ  ϩʔσΟϯάදࣔ ը૾อଘޙʹ  ϑΟϧλʔΛมߋ Ϙλϯ͕ԡ͞ΕͨࡍʹҎԼͷ ॲཧΛߦ͏ϝιου࡞Δ ը૾ΛΩϟϓνϟͯ͠อଘ͢Δ ͕ऴྃͨ͠ΒϩʔσΟϯάඇ දࣔ ͱಉ࣌ʹϑΟϧλʔΛมߋ

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ετϦʔϜͰߟ͑Δ

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ετϦʔϜͰߟ͑ͯΈΔ Ϙλϯλοϓ Ϙλϯλοϓޙɺ  ը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾Λอଘ͞ΕΔ·Ͱ  ϩʔσΟϯάදࣔ ը૾อଘޙʹ  ϑΟϧλʔΛมߋ

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Ϙλϯλοϓ ϩʔσΟϯάදࣔɺ  ɹը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾อଘޙɺϩʔσΟϯάΛ  ɹඇදࣔʹͯ͠ϑΟϧλʔΛมߋ

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ετϦʔϜͰߟ͑ͯΈΔ Ϙλϯͷλοϓ͕ΠϕϯτͷτϦΨʔʹͳΔ Ϙλϯλοϓ Ϙλϯλοϓޙɺ  ը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾Λอଘ͞ΕΔ·Ͱ  ϩʔσΟϯάදࣔ ը૾อଘޙʹ  ϑΟϧλʔΛมߋ

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Ϙλϯλοϓ Ϙλϯλοϓޙɺ  ը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾Λอଘ͞ΕΔ·Ͱ  ϩʔσΟϯάදࣔ ը૾อଘޙʹ  ϑΟϧλʔΛมߋ ετϦʔϜͰߟ͑ͯΈΔ ը૾Ωϟϓνϟͷঢ়ଶભҠ

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ετϦʔϜͰߟ͑ͯΈΔ ը૾ͷΩϟϓνϟঢ়ଶͷ  ετϦʔϜ Ϙλϯλοϓ Ϙλϯλοϓޙɺ  ը૾ΛΩϟϓνϟɺอଘ͢Δ ը૾Λอଘ͞ΕΔ·Ͱ  ϩʔσΟϯάදࣔ ը૾อଘޙʹ  ϑΟϧλʔΛมߋ

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ίʔυ

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ίʔυ ϘλϯͷετϦʔϜΛը૾อଘετϦʔϜʹม׵

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Ϙλϯλοϓ 7PJE qBU.BQϘλϯλοϓˠը૾ͷΩϟϓνϟঢ়ଶʢ(16*NBHF4UJMM$BNFSBͷ3Y֦ு͕ߦ͏ʣ Ωϟϓνϟঢ়ଶ EFGBVMU DBQUVSJOH DBQUVSFE ϘλϯλοϓΠϕϯτ͔ΒΩϟϓνϟঢ়ଶͷετϦʔϜ΁ EFGBVMU

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ίʔυ ΩϟϓνϟதͰ͋Ε͹ϩʔσΟϯάΛදࣔ

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NBQ\DBQUVSJOH^ Ωϟϓνϟঢ়ଶ EFGBVMU DBQUVSJOH DBQUVSFE ϩʔσΟϯάதͰ͋Δ͜ͱΛද͢ετϦʔϜ Ωϟϓνϟத GBMTF USVF GBMTF EFGBVMU GBMTF

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ίʔυ ΩϟϓνϟதͰ͋Ε͹ϩʔσΟϯάΛදࣔ

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ίʔυ Ωϟϓνϟ׬ྃޙΤϑΣΫτΛมߋ

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Ωϟϓνϟঢ়ଶ EFGBVMU DBQUVSJOH DBQUVSFE Ωϟϓνϟঢ়ଶͷετϦʔϜ ΤϑΣΫτΛมߋ

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ίʔυ

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ϢʔβʔͷೖྗɺมԽ͢Δঢ়ଶͳͲΛ ετϦʔϜʹྲྀ͠ɺͦͷ஋ΛͲ͏ѻ͏͔ʁ ͱ͍͏؍఺͔Βߟ͑Δ

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ίʔυΛൺֱ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ࣮૷͠Α

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ϩʔσΟϯάΛ දࣔͩ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ Ωϟϓνϟ͠Α

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ SFTVMUͰ෼ذͯ͠ʜ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ύλʔϯΛ໢ཏͬͱ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ͑ʔͬͱɺͲ͏͢Δ Μ͚ͩͬʁ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ͋ɺͦ͏ͩɻTVDDFTTͰ ΤϑΣΫτΛม͑ΔΜͩ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ͦΜͰɺΤϥʔදࣔͱɻ 0,ɺͰ͖ͨ

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࣮ػ֬ೝ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ͋ɺϩʔσΟϯάফͯ͠ ͳ͔ͬͨʜ

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௨ৗͷίʔυͷ࣮૷࣌ͷྲྀΕ ͜ΕͰ0,

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Α͋͘Δ

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3Y4XJGUͰͷ࣮૷࣌ͷྲྀΕ ࣮૷͠Α

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3Y4XJGUͰͷ࣮૷࣌ͷྲྀΕ ϘλϯͷλοϓΛΩϟϓ νϟঢ়ଶͷετϦʔϜʹ ม׵͢Δ

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3Y4XJGUͰͷ࣮૷࣌ͷྲྀΕ ϩʔσΟϯάத͚ͩͷ  ઒Ͱ΋࡞ͬͯCJOE͢Δ͔

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3Y4XJGUͰͷ࣮૷࣌ͷྲྀΕ DBQUVSFEདྷͨΒΤϑΣ ΫτΛ੾Γସ͑Δͱ

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3Y4XJGUͰͷ࣮૷࣌ͷྲྀΕ Τϥʔ͕དྷͨΒΤϥʔΛ දࣔɻͰ͖ͨ

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ετϦʔϜʢͷ࡞੒Ճ޻؂ࢹʣʹ ϑΥʔΧε͍ͯ͠Δ

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ͳΜͱͳ͓͘෼͔Γ͍͚ͨͩͨͰ͠ΐ͏͔

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Α͠ಋೖ͠Α͏ ͱࢥͬͨํɺͪΐͬͱ଴͍ͬͯͩ͘͞

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ຊ౰ʹಋೖ͢Δඞཁ͸͋Γ·͔͢ʁ

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ಛʹ໰୊͸ͳ͍ɻΘ͟Θ͟3Yʹ͢Δඞཁ͸͋Δͷ͔ʁ

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3Y͸ۜͷ஄ؙͰ͸ͳ͍

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ྑ͍ͱ͜Ζɺѱ͍ͱ͜Ζ  ʢ૊৫ͱͯ͠Ͱ͸ͳ͘ݸਓͱͯ͠ͷײ૝ʣ

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ྑ͍ͱ͜Ζ w ίʔυ͕ಡΈ΍͍͢ w ͦΕ͕ϢʔβʔͷೖྗͰ͋ΕɺจࣈྻͰ͋Εɺඇಉ ظॲཧͰ͋ΕͳΜͰ͋ͬͯ΋ɺετϦʔϜΛͲ͏ѻ ͏͔ͱ͍͏఺ʹूத࣮ͯ͠૷͕Ͱ͖ΔΑ͏ʹͳͬͨ w ඇಉظॲཧͷ࣮૷͸ҎલΑΓ΋ָʹͳͬͨؾ͕͢Δ

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ѱ͍ͱ͜Ζ w ֶशίετ͕ߴ͍ w ·͖ͩΕ͍ͳ઒ετϦʔϜ͕࡞Εͳ͍ w 3Y.BSCMFTΛݟͨΓɺطଘͷιʔεΛಡΜͩΓͯ͠ଟ͘ͷ͜ͱΛֶ ΜͰ͍Δ࠷த w ϝϯόʔͷೖΕସΘΓ͕ଟ͍ͱݫͦ͠͏ w ϑϨʔϜϫʔΫʹେ͖͘ґଘ͢Δ͜ͱʹͳΔ w Ծʹ3Y͕ϝϯςφϯε͞Εͳ͘ͳͬͨ৔߹Ͳ͏ͳΔʁ w ʢͨͩ͠3Yࣗମʹେ͖ͳܽ఺͸ͳ͍ͱࢥ͏ʣ

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ι΢κ΢ͰͷऔΓ૊Έ

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IUUQTTQFBLFSEFDLDPNCSJDLMJGFSFBDUJWFDPDPBGBMTFZVSVJTIBPKJFUPNFSVLBSJEFGBMTFIVPZPOHTIJMJ

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IUUQTTQFBLFSEFDLDPNCSJDLMJGFSFBDUJWFDPDPBGBMTFZVSVJTIBPKJFUPNFSVLBSJEFGBMTFIVPZPOHTIJMJ

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TVTIJTIPLVOJʹΑΔϨϏϡʔΞαΠϯ w ι΢κ΢Ͱ͸TVTIJTIPLVOJͱ͍͏#05͕  ιʔεϨϏϡʔΛϥϯμϜͰΞαΠϯͯ͘͠ΕΔ w νʔϜྗͷఈ্͛

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·ͱΊ w 3Y4XJGUʹΑͬͯετϦʔϜΛͲ͏ѻ͏͔ͱ͍͏؍఺͔Βઃܭɾ࣮૷ Λߦ͏Α͏ʹͳͬͨ w ঢ়ଶͷมԽʹ೰·͞Ε͍ͯΔ৔߹ɺ༗༻ͳπʔϧʹͳΔ͔΋͠Ε· ͤΜ w ۜͷ஄ؙͰ͸ͳ͍ w νʔϜόϥϯεɺϝϯόʔͷೖΕସΘΓͷස౓ͳͲͳͲɺ  ֶशίετͷ؍఺͔Βߟྀ͢΂͖͜ͱ͸ଟ͍ w طଘͷίʔυ͕͋Δ৔߹͸ɺࠓ೔ݟ͖ͯͨΑ͏ʹɺطଘͷ࣮૷Λε τϦʔϜΛ؍఺ʹઃܭɾ࣮૷ͯ͠Έͯ޾ͤʹͳΕΔ͔Λ͔֬ΊͯΈ Δͱྑ͍͔΋

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ࢀߟࢿྉ w IUUQTTQFBLFSEFDLDPNCSJDLMJGFSFBDUJWFDPDPBGBMTFZVSVJTIBP KJFUPNFSVLBSJEFGBMTFIVPZPOHTIJMJ w IUUQTTQFBLFSEFDLDPNCSJDLMJGFBUVUFLBJGBGBMTFKJTIVTXJGU UPSYTXJGU w IUUQTTQFBLFSEFDLDPNCSJDLMJGFTXJGUEPUEFSYTXJGU SFBDULJUSFBDUJWFDPDPBXPTIJUVUFNJUB w IUUQTTQFBLFSEFDLDPNJTILBXBSYUFTUT w IUUQTTQFBLFSEFDLDPNJTILBXBSYTXJGUQMVTNWWN

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ऴΘΓ