DNSの話1 ~ Webアプリエンジニアの一人ネットワーク勉強会

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8FCΞϓϦΤϯδχΞͷ ҰਓωοτϫʔΫษڧձ %/4ʹ͍ͭͯ XPTIJEBO

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࠷ॳʹ w Ͱ͖Δۀ຿ͷൣғΛ૿΍͍ͨ͠8FCΞϓϦΤϯδ χΞͷಠֶ·ͱΊࢿྉͰ͢ w ͪΌΜͱͨ͠ղઆ͸ࢀߟεϥΠυͳͲΛͨͲͬͯ͘ ͍ͩ͞ w ਤղʹ͢Δͱ෼͔Γ΍ͦ͢͏͚ͩͬͨͲɺϒϩάʹ ਤΛషΔͷ͕ΊΜͲ͗ͯ͘͢͞εϥΠυ࡞ͬͯεϥ ΠυΛϒϩάʹషΔ͜ͱʹͨ͠Α͏ͳͦΕͰ͢

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– http://www.infraexpert.com/study/tcpip15.html l%/4 %PNBJO/BNF4ZTUFN ͸ɺυϝΠϯ໊ʢίϯϐϡʔλΛࣝผ͢ Δ໊শʣΛ*1ΞυϨεʹࣗಈతʹม׵ͯ͘͠ΕΔΞϓϦέʔγϣϯ૚ϓϩτ ίϧͰ͢ɻ %/4ͷ࢓૊ΈʹΑΓɺ֮͑ʹ͍͘*1ΞυϨεͰ͸ͳ͘ϩʔϚࣈͰ63-Λೖ ྗ͠8FCΞΫηεͨ͠ΓɺϩʔϚࣈͰϝʔϧΞυϨεΛೖྗͯ͠ϝʔϧૹ৴ ͕Ͱ͖·͢ɻz

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ࡢ೔ ɺ%/4ͷ࠶ؼ໰͍߹Θ͕ͤΘ͔ Βͳ͍ͱ͍͏࿩Λͯ͠ऴΘͬͨͷͰɺ ࠓ೔͸%/4ʹ͍ͭͯ

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%/4ͱ͸ w υϝΠϯ໊ XXXXPTIJEBOFYBNQMFDPN Λ*1Ξ υϨεʹࣗಈతʹม׵͢ΔΞϓϦέʔγϣϯ૚ϓϩ τίϧ w )551ͱ͔'51ͱ͔ಉ͡૚ͷϨΠϠʔͷϓϩτίϧ w #*/%ͱ͔8JOEPXTͷ%/4αʔόͱ͔Ͱߏங w ͔ͩΒ࣍ͷεϥΠυͰ)551ͱ͔'51ͱ͔ͷύέο τͱൺ΂ͯΈΔͱ

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)551΍%/4ͷύέοτ *1ϔομ5$16%1ϔομ ͦͷϓϩτίϧͷσʔλʹ ͳͬͯΔ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM

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)551΍%/4ͷύέοτ छྨύέοτͷछྨ͕ ͋Δͷ͸ޙͰ࿩͠·͢

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υϝΠϯͷߏ଄ʹ͍ͭͯ w ͦ΋ͦ΋ɺ%/4Ͱ*1ΞυϨεͱରԠௐ΂ͯΔυϝΠ ϯͬͯͲΜͳͷ

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υϝΠϯͷߏ଄ʹ͍ͭͯ XXXFYBNQMFDPKQ ੺ઢͰҾ͍ͨͱ͜ΖͦΕͧΕ໊લ͕͋Δ

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υϝΠϯͷߏ଄ʹ͍ͭͯ XXXFYBNQMFDPKQ τοϓϨϕϧυϝΠϯ 5-% ࠃผɺ஍Ҭɺ ɹ঎༻ͳͲΛද͢υϝΠϯ

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υϝΠϯͷߏ଄ʹ͍ͭͯ XXXFYBNQMFDPKQ ηΧϯυϨϕϧυϝΠϯ 4-% ૊৫ͷछྨΛද͢υϝΠϯ Ұ෦τοϓϨϕϧυϝΠϯ DPNFUD Ͱ͸ͳ͔ͬͨΓ

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υϝΠϯͷߏ଄ʹ͍ͭͯ XXXFYBNQMFDPKQ αʔυϨϕϧυϝΠϯ ۩ମతͳاۀ໊΍૊৫ͳͲΛද͢υϝΠϯ τοϓϨϕϧυϝΠϯ DPNFUD ʹ΋ΑΔ

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υϝΠϯͷߏ଄ʹ͍ͭͯ XXXFYBNQMFDPKQ ϑΥʔεϨϕϧυϝΠϯ ϗετ໊ʹ͋ͨΔυϝΠϯɻ αʔόͷ໾ׂ΍αʔόͰಈ͍ͯΔΞϓϦέʔγϣ ϯʹΑͬͯʮXXXʯʮGUQʯ ΞϓϦέʔγϣϯͷ ϓϩτίϧ ɺʮBQQʯʮNBOBHFʯ ಉҰυϝΠ ϯ಺Ͱͷίϯϐϡʔλͷ໾ׂ ɺʮUFTUʯ ʮJOUFHSBUJPOʯ ಈ࡞؀ڥ ౳ͷ͚ͭํ͋Γ

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%/4ͷߏ੒ʹ͍ͭͯ w %/4 %PNBJO/BNF4ZTUFN Λߏ੒͍ͯ͠Δίϯ ϐϡʔλ͸େ͖͘෼͚ͯ%/4αʔόͱϦκϧόʹ Θ͚ΒΕΔ

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%/4αʔόʹ͍ͭͯ w %/4αʔό͸υϝΠϯͷ֊૚͝ͱʹଘࡏ͢Δ w ϧʔτ%/4αʔό͸શੈքͰՕॴ͋Δ w ϧʔτ%/4αʔό͸ɺԼҐͷ%/4ʢKQͷ%/4αʔ όɺDPNͷ%/4αʔό ͷ*1ΞυϨεΛ؅ཧ w %/4αʔό͸ɺͦͷυϝΠϯͷυϝΠϯ໊ͱ*1Ξ υϨεͷରԠද͚ͩͰͳ͘ԼҐ%/4αʔόͷ*1Ξ υϨε΋؅ཧ

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Ϧκϧόʹ͍ͭͯ w 1$ͳͲ͕υϝΠϯ໊Λݩʹ*1ΞυϨεΛਘͶΔɺΫϥΠΞϯτϓϩάϥ Ϝٴͼαʔό w %/4ΫϥΠΞϯτͱ΋͍͏ w ͍ΘΏΔ%/4༻ͷίϯϐϡʔλͰ΋Ϧκϧόͷ໾໨͚͍ͩͯ͠Δ΋ͷ΋ w ͦͷ͏ͪɺ໰͍߹Θ͚ͤͩ͢Δ΋ͷ͸ελϒϦκϧόɻΩϟογϡ͸ อଘͰ͖ΔͷͰࣾ಺%/4Λ֊૚తʹߏங͢Δͱ͖ؒʹڬΉ͜ͱ΋ w ࠶ؼ໰͍߹ΘͤΛड͚ͨΒ൓෮໰͍߹Θͤ ࣍ճ Λ܁Γฦͯ͠ඞͣ*1 ΞυϨεΛҾͬுͬͯ͘Δ·Ͱಇ͍ͯ͘ΕΔϦκϧό͸ϑϧαʔϏε Ϧκϧόͱ͍͏

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Ϧκϧόʹ͍ͭͯ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM

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%/4αʔόͷ৑௕ੑʹ͍ͭͯ w %/4αʔόʹ΋଱ো֐ੑΛ͋͛ΔͨΊͷ࢓૊Έ͕ ͋Δ

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%/4αʔόͷ৑௕ੑʹ͍ͭͯ w %/4αʔόʹ͸ϓϥΠϚϦ%/4αʔόͱɺϓϥΠϚϦ αʔόʹର͠ηΧϯμϦ%/4αʔό ෳ਺͋Δ͜ͱ΋ ͕͋ Δ w ϓϥΠϚϦ%/4αʔό͸ఆظతʹηΧϯμϦ%/4αʔόʹ σʔλΛಉظͤ͞Δ ͜ͷͱ͖ͷ௨৴Λκʔϯసૹͱ͍͏ w Կ͔͋ͬͨͱ͖͸ηΧϯμϦ%/4αʔό͔ΒσʔλΛऔಘ ͯ͠෮׆ͤͨ͞ΓɺηΧϯμϦ%/4αʔόΛҰ࣌తʹར༻ ͨ͠Γ͢Δ

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%/4ͷύέοτ w κʔϯసૹͷ࿩͕ग़͖ͯͨͷͰઌ΄Ͳͷ%/4αʔό ͷύέοτ͕छྨ͋Δ݅ʹ͍ͭͯݟͯΈΔ

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%/4ͷύέοτ

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%/4ͷύέοτ Ϧκϧό͕%/4αʔόʹߦ͏υϝΠϯ໊͔Βͷ*1ΞυϨεͷ໊લղ ܾʹ͸6%1ʢϙʔτ൪߸ʣΛ࢖༻ %/4αʔόͱ%/4αʔόͱ͕κʔϯ৘ใͷϑΝΠϧసૹΛߦ͏৔߹ 5$1 ϙʔτ൪߸ʣΛ࢖༻

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%/4ͷύέοτ Ϧκϧό͕%/4αʔόʹߦ͏υϝΠϯ໊͔Βͷ*1ΞυϨεͷ໊લղ ܾʹ͸6%1ʢϙʔτ൪߸ʣΛ࢖༻ %/4αʔόͱ%/4αʔόͱ͕κʔϯ৘ใͷϑΝΠϧసૹΛߦ͏৔߹ 5$1 ϙʔτ൪߸ʣΛ࢖༻ ͍͟ͱ͍͏ͱ͖ͷόοΫΞοϓͷͨΊͷσʔ λ͸ਖ਼͘͠ૹΕͳ͍ͱࠔΔͷͰ5$1 සൟʹߦΘΕΔ໊લղܾͷϦΫΤετ༻ͷ௨৴ ͸ؒҧͬͯ΋ฉ͖௚ͤ͹͍͍͠଎౓༏ઌͰ6%1

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%/4αʔόʹ͍ͭͯ w ͯ͞

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%/4αʔόʹ͍ͭͯ w %/4αʔό͸ͦͷυϝΠϯͷυϝΠϯ໊ͱ*1Ξυ ϨεͷରԠද͚ͩͰͳ͘ԼҐ%/4αʔόͷ*1Ξυ Ϩε΋؅ཧ

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%/4αʔόʹ͍ͭͯ w ؅ཧͬͯαʔόʹอଘͱ͔ͯ͠ΔΜͩͱࢥ͏Μ͚ͩ ͲɺͲ͏΍ͬͯΔͷ

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%/4αʔό಺ͷσʔλͷ࿩ w %/4αʔό͸υϝΠϯ໊ͱ*1ΞυϨεͷରԠͤ͞Δ σʔλΛͨ͘͞Μ͍࣋ͬͯ·͕͢ɺͦΕΛϦιʔε Ϩίʔυͱ͍͏ w ϦιʔεϨίʔυͷू߹ମͰ͋Δσʔλϕʔε͸ κʔϯϑΝΠϧͱݺ͹Ε͍ͯΔ w ໊લղܾͷͱ͖͸κʔϯϑΝΠϧதͷϦιʔεϨίʔ υΛҾ͍ͯΔ ͨͿΜ

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κʔϯϑΝΠϧͷྫ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM

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κʔϯϑΝΠϧͷྫ ʜಡΊͳ͔ͬͨͷͰҰͭͣͭ֬ೝ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 55-%/4αʔό͕κʔϯϑΝΠϧͷσʔλΛΩϟογϡ ͢Δ࣌ؒ σϑΥϧτ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 03*(*/͜ͷ%/4αʔόͰѻ͏υϝΠϯ໊ϦιʔεϨίʔ υͷهड़Λ͍ͯ͘͠ͱ͖ɺ03*(*/ͷ෦෼ΛলུͰ͖Δ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 03*(*/͜ͷ%/4αʔόͰѻ͏υϝΠϯ໊ϦιʔεϨίʔ υͷهड़Λ͍ͯ͘͠ͱ͖ɺ03*(*/ͷ෦෼ΛলུͰ͖Δ ͨͱ͑͹੺࿮ͷ෦෼͸*//4OTͱॻ͍ͯ΋ྑ͍

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM !͕͋ΔҰ൪ࠨଆͷ෦෼͸ϥϕϧͱ͍ͬͯɺυϝΠϯΛॻ ͘ɻϗετͷޙͷ෦෼͕ΦϦδϯͱಉ͡৔߹͸লུ͞Εͯ ͍Δɻ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM ·ͨɺલͷߦͱѻ͏ϥϕϧ͕ಉ͡৔ ߹͸ϥϕϧΛলུͰ͖Δ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM !͸ϥϕϧ͕ΦϦδϯͱશ͘ಉ͡υϝΠϯΛ͢͞ͱ͖ͷল ུه߸

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM Ϋϥεࢦఆɻ*/͸Πϯλʔωοτ༻ͷࢦఆͱ͍ ͏ҙຯͰجຊతʹ͜Ε͔͠ग़ͯ͜ͳ͍

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM λΠϓࢦఆɻϦιʔεϨίʔυͷछྨ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM ϦιʔεσʔλɻλΠϓʹରԠͨ͠ σʔλ͕ฒΜͰΔ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ OTJOGSBFZFDPN υϝΠϯΛϑϧʹॻ͘ͱ͖͸࠷ޙʹΛ͚ͭ Δ ͜ͷκʔϯϑΝΠϧͷσʔλΛ࣋ͭϓϥΠϚϦʔ%/4αʔό

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ QPTUNBTUFSJOGSBFZFDPN ͜ͷυϝΠϯͷ؅ཧऀͷϝʔϧΞυϨεɻ؅ཧऀͱͷ࿈བྷ༻ʹ࢖ ༻͢Δɻͳ͓ɺϝʔϧιϑτʹೖྗ͢Δͱ͖͸ɺϗετͷޙͷ͸ !ʹม׵͢Δ͜ͱɻ QPTUNBTUFSJOGSBFZFDPN QPTUNBTUFS!JOGSBFZFDPN

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ 4FSJBM κʔϯϑΝΠϧͷόʔδϣϯΛද͢਺ࣈɻ  ؅ཧऀ͕ࣗ༝ʹઃఆͰ͖ɺߋ৽͢Δͱ͖͸ৗʹݱࡏΑΓେ͖͍஋Λ ೖΕΔඞཁ͕͋Δ ߋ৽࣌ʹࣗಈతʹೖΔ৔߹΋

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ 3FGSFTI ඵ ηΧϯμϦ%/4αʔό͕ɺϓϥΠϚϦ %/4αʔόͷσʔλߋ৽Λ֬ೝ͠ʹߦ࣌ؒ͘ͷִؒɻ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ 3FUSZ ඵ ηΧϯμϦ%/4αʔό͕ɺ3FGSFTIͰκʔϯ৘ ใͷߋ৽ʹࣦഊͨ͠৔߹ʹ࠶౓3FGSFTIΛࢼΈΔ·Ͱͷ࣌ؒɻ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ &91*3& ඵ ηΧϯμϦ%/4αʔό͕ɺκʔϯ৘ใͷϦ ϑϨογϡ͕Ͱ͖ͳ͍ঢ়ଶ͕ଓ͍ͨ৔߹ɺηΧϯμϦ%/4αʔό ͕͍࣋ͬͯΔκʔϯ৘ใΛͲΕ͚ͩͷ࣌ؒར༻͢Δ͔ͷ࣌ؒɻ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM 40"4UBSUPG"VUIPSJUZͷུɻκʔϯϑΝΠϧͷ࠷ॳͷϦιʔ εϨίʔυͰɺҎԼͷ%/4αʔόͷ֤छ؅ཧ৘ใͷࢦఆ͢Δ .JOVNVN55- ඵ κʔϯϑΝΠϧதͷϦιʔεϨίʔυ ʹଘࡏ͠ͳ͍υϝΠϯͷ໰͍߹Θ͕ͤདྷͯɺͦͷυϝΠϯʹ͍ͭͯ Αͦͷ%/4αʔόΛ໰͍߹Θͤͨͱ͖ɺ໰͍߹Θͤ݁ՌΛอ࣋͠ ͓ͯ࣌ؒ͘

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM /4/BNF4FSWFSͷུɻυϝΠϯ໊ͱɺͦͷυϝΠϯ໊Λ؅ཧ ͢Δ%/4αʔόΛରԠ෇͚ͨϨίʔυ

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κʔϯϑΝΠϧৄࡉ ը૾Ҿ༻ݩ IUUQXXXJOGSBFYQFSUDPNTUVEZUDQJQIUNM .9.BJMFYDIBOHFͷུɻυϝΠϯͷϝʔϧαʔόΛࢦఆ

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