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ͳͥ4DBMBͰมΘͬͨͷ͔ 5BJTVLF0F!0&@VJB

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8IPBN* w 5BJTVLF0F<ˏ0&@VJB> w ϑϦʔϥϯεΤϯδχΞ w ࣮ફ4DBMBೖ໳ڞஶऀ w 4DBMB.BUTVSJ 4DBMBUIPOओ࠵ w ג ηϓςʔχɾΦϦδφϧٕज़ ΞυόΠβʔ

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ࠓ೔͸4DBMBͷ࿩

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4DBMBͷ࣮૷΋େ٧Ί w MBNQFQqEPUUZϦϙδτϦͰ։ൃਐߦத w ೥݄%PUUZ3$ʹͯʮ'FBUVSF$PNQMFUFʯͷΞφ΢ϯε w ೥தʹ4DBMBϦϦʔεΛ༧ఆ w 5IF3PBE5P4DBMB w ެࣜαϙʔτ͞ΕΔ*%&͸ݱࡏ7JTVBM4UVEJP$PEFͷΈ w ݱࡏ%PUUZ-BOHVBHF4FSWFS࣮૷Λར༻ w .FUBMT΋αϙʔτ༧ఆ


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ຊ೔࿩͢͜ͱ w 4DBMBͰ͸ɺݴޠઃܭશൠʹมߋ͕Ճ͑ΒΕ͍ͯΔ w ܕγεςϜɺ৽ػೳɺΩʔϫʔυɺͦͷ΄͔ߏจͳͲɺର৅΋༷ʑ w େࡶ೺ʹ͍͑͹ɺҰ௨Γ࣮૷׬ྃɻ͕ͩεςʔλε͸༷ʑ w ΄΅࢓༷͕֬ఆͯ͠Δ΋ͷ w ࢓༷͕Ұ෦ٞ࿦தͷ΋ͷ w ࠾༻ੋඇ͸ະ֬ఆ͕ͩɺࢼݧతʹ࣮૷ࡁΈ

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ຊ೔࿩͢͜ͱ w 4DBMBͷมߋ఺ʹ͍ͭͯɺʮͲ͏มΘΔͷ͔ʯ͸ެࣜ υΩϡϝϯτΛಡΉͷ͕Ұ൪ w %PUUZ%PDVNFOUBUJPO w ʮͳͥมߋ͞ΕΔͷ͔ʯͱ͍͏ετʔϦʔʹয఺Λ͋ ͯͭͭɺղઆ͠·͢ɻ

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4DBMB։ൃͷྺ࢙

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4DBMB։ൃͷྺ࢙

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4DBMB։ൃͷྺ࢙ w MBNQFQqEPUUZ͕೥݄೔ʹग़ݱ

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%PUUZͷൃද w .BSUJO0EFSTLZڭतʹΑΔ4USBOHF-PPQͷߨԋ w ౰࣌ɺ%PUUZ͸৽ݴޠͷίʔυωʔϜͩͬͨ

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ྑ͍ઃܭΛൃݟ͢ΔͨΊͷݴޠ w 4DBMB͸ɺྑ͍ઃܭΛൃݟͰ͖ΔݴޠΛ໨ࢦ͍ͯ͠Δ w ࠓճɺҎԼͷ̎ͭʹϑΥʔΧεͯ͠঺հ͠·͢ w ܕͷઃܭ w Ϟδϡʔϧͷઃܭ

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ܕͷઃܭ w ߹ซܕ c  w ަࠩܕ   w ܕϥϜμ

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߹ซܕ 6OJPO5ZQF w "c# w ʮ"΋͘͠͸#ʯΛද͢ܕ w "͓Αͼ#ͷTVQFSUZQF w -FBTU6QQFS#PVOEͷܭࢉΛ༗ݶʹͰ͖Δ w ࢀߟ4*11SPQPTBMUP"EE6OJPO5ZQFTUPUIF-BOHVBHF w "c##c"

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-FBTU6QQFS#PVOE w ࿨༁͢Δͱʮ࠷খ্քʯɻ w MVCͱ΋ུ͞ΕΔɻ w ʮ͋Δܕͷू߹9ʹ͍ͭͯɺ9ͷ্ݶڥք͔ΒͳΔू߹& ʹ࠷খݩ͕ଘࡏ͢Δ৔߹ɺͦͷ࠷খݩʯͷ͜ͱΛࢦ͢ɻ w 4DBMBͰ͸ܕਪ࿦ͷࡍͳͲɺසൟʹܭࢉ͞ΕΔɻ

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-FBTU6QQFS#PVOE ֓આ w ͬ͘͟Γݴ͑͹ʮෳ਺ͷܕʹڞ௨͢ΔTVQFSUZQFͷ͏ͪɺ࠷΋TVCUZQFʯ w ྫ )PHFͱ'VHBͷMVC͸1SPEVDUXJUI4FSJBMJ[BCMF w 4DBMBYͰ͸MVCͰແݶͷܭࢉ͕ඞཁʹͳΔέʔε͕͋Γɺۙࣅ஋Λ࢖͏ͳͲ ͍ͯ͠Δɻ w 4DBMBͰ͸߹ซܕʹΑΓɺ͠͹͠͹༗ݶͷܭࢉͰ͓͞ΊΒΕΔɻ case class Hoge() case class Fuga() val list = List(Hoge(), Fuga()) //Scala 2.13.1 //list: List[Product with java.io.Serializable] = List(Hoge(), Fuga())

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MVCܭࢉͰ߹ซܕ͕໾ཱͭ trait C[+T] trait D trait E class A extends C[A] with D class B extends C[B] with D with E val list = List(new A(), new B()) //Scala 2.13.1 //list: List[C[C[D] with D] with D] = List(A@456b140f, B@2459333a) //Dotty 0.21.0-RC1 //val list: List[C[A | B] & D] = List(A@2737a1e5, B@7bebb2d0)

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w 4DBMB w ༨ஊ ίϯύΠϧ௨Γ·͢ scala> list.head res9: C[C[D] with D] with D = A@6e00d737 scala> val a: C[C[D] with D] with D = new A() a: C[C[D] with D] with D = A@10b7b5f0

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ަࠩܕ *OUFSTFDUJPOBM5ZQF w "# w "͓Αͼ#ͷTVCUZQF w "##" w "XJUI##XJUI"ͱͳΔέʔε͕͋Δ w "XJUI#ܕ DPNQPVOEUZQF Λஔ͖׵͑Δ༧ఆ w OFX FYUFOETʹ͸Ҿ͖ଓ͖࢒Δ

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ܕϥϜμ

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4DBMBͷߴ֊(FOFSJDT w 4DBMB͸ߴ֊ͷ(FOFSJDTΛαϙʔτ͍ͯ͠Δ w ܕύϥϝʔλʹܕίϯετϥΫλ౉͢৔߹ɺܕίϯετ ϥΫλύϥϝʔλͷ਺͕Ұக͢Δඞཁ͕͋Δɻ w scala> //ߴ֊ͷGenericsɻܕίϯετϥΫλFΛड͚औΔɻ scala> class A[F[_]] defined class A scala> //ListΛܕίϯετϥΫλͱͯ͠౉͢ɻ scala> new A[List]() res0: A[List] = A@188b6035 scala> //MapΛܕίϯετϥΫλͱͯ͠౉͢ɻ scala> new A[Map]() ^ error: Map takes two type parameters, expected: one

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w 4DBMBͰܕίϯετϥΫλΛఆٛ͢ΔͨΊʹɺຖճUZQFఆٛ͢Δͷ͕৑௕ʜͱ͍͏͜ͱͰੜΈग़͞ΕͨΠ σΟΦϜ w ߏ଄త෦෼ܕʴந৅ܕϝϯόʴܕࣹӨΛར༻͍ͯ͠Δ͕ɺ෼͔Γʹ͍͘ߏจͳͷ͕೉఺ɻ w 4DBMBɺίϯύΠϥϓϥάΠϯͳ͠ w trait MyFunctor[F[_]]{ def map[T, U](f: F[T])(func: T => U):F[U] } class EitherMyFunctor[L] extends MyFunctor[({ type λ[R] = Either[L, R]})#λ]{ def map[T, U](f: Either[L, T])(func: T => U): Either[L, U] = f match { case Right(r) => Right(func(r)) case Left(l) => Left(l) } } ແ໊ܕίϯετϥΫλ

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w UZQFMFWFMLJOEQSPKFDUPS͸ɺܕϥϜμ ͰܕίϯετϥΫλ Λهड़͢ΔͨΊͷίϯύΠϥϓϥάΠϯ w ͜͜Ͱ ͸ɺܕϥϜμͷQMBDFIPMEFSߏจɻ w ࢀߟ஋ϨϕϧͷQMBDFIPMEFSߏจʜ-JTU  NBQ G @  w trait MyFunctor[F[_]]{ def map[T, U](f: F[T])(func: T => U):F[U] } class EitherMyFunctor[L] extends MyFunctor[λ[R => Either[L, R]]]{ def map[T, U](f: Either[L, T])(func: T => U): Either[L, U] = f match { case Right(r) => Right(func(r)) case Left(l) => Left(l) } } class AnotherEitherMyFunctor[L] extends MyFunctor[Either[L, *]]{ def map[T, U](f: Either[L, T])(func: T => U): Either[L, U] = f match { case Right(r) => Right(func(r)) case Left(l) => Left(l) } } ,JOEQSPKFDUPS

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ܕϥϜμ5ZQF-BNCEB w 4DBMBͰ͸ɺσϑΥϧτͰܕϥϜμ͕αϙʔτ͞ΕΔ w trait MyFunctor[F[_]]{ def map[T, U](f: F[T])(func: T => U):F[U] } class EitherMyFunctor[L] extends MyFunctor[[R] =>> Either[L, R]] { def map[T, U](f: Either[L, T])(func: T => U): Either[L, U] = f match { case Right(r) => Right(func(r)) case Left(l) => Left(l) } }

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ܕϥϜμ5ZQF-BNCEB w %PUUZ͔ΒɺNJHSBUJPOͷͨΊʹ:LJOEQSPKFDUPSϑϥά ͰLJOEQSPKFDUPSޓ׵ͷQMBDFIPMEFSߏจ͕௥Ճ͞ΕΔɻ w ࢀߟ'JY*NQMFNFOULJOEQSPKFDUPS DPNQBUJCJMJUZ w trait MyFunctor[F[_]]{ def map[T, U](f: F[T])(func: T => U):F[U] } class EitherMyFunctor[L] extends MyFunctor[Either[L, *]]{ def map[T, U](f: Either[L, T])(func: T => U): Either[L, U] = f match { case Right(r) => Right(func(r)) case Left(l) => Left(l) } }

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ϫΠϧυΧʔυܕมߋͷఏҊ w 1SF4*1VTJOHVOEFSTDPSFTGPSUZQFMBNCEBT w 4DBMBYͰ͸ɺΞϯμʔείΞ ྫ'<@> ͸ϫΠϧυΧʔυܕΛද͢ɻ w ܕϥϜμͷQMBDFIPMEFSߏจͰ΋ɺΞϯμʔείΞΛ࢖͍͍ͨ w ϫΠϧυΧʔυܕʹׂΓ౰ͯΔه߸Λม͑Ε͹Α͍ͷͰ͸  w +BWBಉ༷ ʹ͢ΔҊ w /* ҎԼͷίʔυ͸·ͩίϯύΠϧ௨Βͳ͍͕ɺ΋࣮͠ݱ͢Δͱ͜͏ͳΔɻ Dotty-0.21.0-RC1ݱࡏͷঢ়گ: - ? ΋ɺϫΠϧυΧʔυܕͱͯ͠࢖͑Δ - _ ΛɺܕϥϜμͷplaceholderߏจͱͯ͠࢖͑ͳ͍ɻ */ trait MyFunctor[F[?]]{ def map[T, U](f: F[T])(func: T => U):F[U] } class EitherMyFunctor[L] extends MyFunctor[Either[L, _]]{ def map[T, U](f: Either[L, T])(func: T => U): Either[L, U] = f match { case Right(r) => Right(func(r)) case Left(l) => Left(l) } }

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ϫΠϧυΧʔυܕมߋͷಓఔ w ΋࣮͠ݱ͢ΔͱɺΞϯμʔείΞ@ͷར༻৔ॴ͕ಉ͡Ͱɺ༻్͚ͩมΘΔɻ w ιʔεͷޓ׵ੑΛഁյ͢Δɻ w ౓ͷมߋͰࡁ·ͳ͍ w ௕ظʹΘͨΔNJHSBUJPOϓϥϯ͕ఏҊ͞Ε͍ͯΔʢ͕ɺ·ͨະ֬ఆ  w 4DBMBYLJOEQSPKFDUPSʜܕϥϜμQMBDFIPMEFSΛ ͔Β ΁มߋ ࡁ  w 4DBMBʜ@ͱ ΛϫΠϧυΧʔυܕͱͯ͠ڐ༰ @͸TUSJDUͰඇਪ঑ ΠϚίί w 4DBMBʜϫΠϧυΧʔυܕͱͯ͠ͷ@ར༻Λඇਪ঑ w 4DBMBʜϫΠϧυΧʔυܕͱͯ͠ͷ@Λ࡟আ w 4DBMBʜܕϥϜμͷQMBDFIPMEFSͱͯ͠@Λ௥Ճ

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Ϟδϡʔϧͷઃܭ

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ܧঝΑΓ߹੒ w &⒎FDUJWF+BWBOEFEJUJPOΑΓҾ༻ w *UFN'BWPSDPNQPTJUJPOPWFSJOIFSJUBODF w 6OMJLFNFUIPEJOWPDBUJPO JOIFSJUBODFWJPMBUFTFODBQTVMBUJPO w *UFN%FTJHOBOEEPDVNFOUGPSJOIFSJUBODFPSFMTFQSPIJCJUJU w ܧঝͰTVQFSUZQFͷ࣮૷Λमਖ਼͢ΔͱɺͦͷΧϓηϧԽΛഁյ͢ΔՄೳੑ͕͋Δɻ w ܧঝ͢Δඞཁ͕ͳ͍ݶΓɺ߹੒ͱϝιουݺͼग़͠Λར༻͢Δ΂͠ɻ w ܧঝ͍ͤͨ͞ΫϥεΛ໌ࣔ͠ɺద੾ʹઃܭ͢Δɻͦͷ΄͔͸ܧঝΛආ͚Δɻ

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ܧঝΑΓ߹੒ w ʰࠓ·Ͱͷͱ͜Ζɺ4DBMBΛؚΉΦϒδΣΫτࢦ޲ݴޠ ͸ɺ߹੒ΑΓ΋ܧঝͷํ͕؆୯Ͱ͋ΔɻܧঝͰ͸ FYUFOETઅ͚͕ͩඞཁͳҰํɺ߹੒Ͱ͸ɺҰ࿈ͷҕৡͷ ͨΊʹ৑௕ͳ࿑ۤΛඞཁͱ͢Δɻʱ w ʰͦͷҙຯʹ͓͍ͯɺΦϒδΣΫτࢦ޲ݴޠ͸ɺϓϩά ϥϚΛڧྗ͗͢Δख๏΁ͱۦΓཱ͍ͯͯΔɻʱ w IUUQTEPUUZFQqDIEPDTSFGFSFODFPUIFSOFXGFBUVSFTFYQPSUIUNMNPUJWBUJPOΑ Γൈਮɾ຋༁

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ܧঝΑΓ߹੒͢ΔͨΊͷػೳ w ܧঝ͍ͤͨ͞ΫϥεΛ໌ࣔͤ͞ΔPQFO w ҕৡΛ؆୯ʹ͢ΔFYQPSU

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0QFO w DMBTTͷ৽ͨͳΞΫηεम০ࢠ w ܧঝ͞ΕΔ͜ͱΛҙਤͨ͠DMBTTʹ͚ͭΔ w PQFODMBTTͰ͸ͳ͍۩৅ΫϥεΛಉҰιʔε֎͔Βܧ ঝ͢Δͱɺܯࠂ͞ΕΔ w 4DBMBͰ͸TUSJDUϑϥά͕༗ޮͳ͚࣌ͩܯࠂ w JNQPSUTDBMBMBOHVBHFBEIPD&YUFOTJPOTͰܯࠂ཈੍

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0QFO //openclass.scala package p open class PleaseExtendMe { def hello(name: String): String = s"Hello, ${name}!" } class DontWantToExtendMe { def hello(name: String): String = s"Hello, ${name}!" } //subtype.scala package p class A extends PleaseExtendMe { override def hello(name: String): String = super.hello(name) + " " } class B extends DontWantToExtendMe { override def hello(name: String): String = super.hello(name) + " "

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0QFO w EPUDTUSJDU w [warn] -- Feature Warning: /Users/{my path}/DottySandbox/src/main/scala/oop/subtype.scala: 7:16 [warn] 7 |class B extends DontWantToExtendMe { [warn] | ^^^^^^^^^^^^^^^^^^ [warn] |Unless class DontWantToExtendMe is declared 'open', its extension in a separate file should be enabled [warn] |by adding the import clause 'import scala.language.adhocExtensions' [warn] |or by setting the compiler option -language:adhocExtensions. [warn] |See the Scala docs for value scala.language.adhocExtensions for a discussion [warn] |why the feature should be explicitly enabled.

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ܧঝؔ࿈ͷम০ࢠ੔ཧ w ಉҰιʔεϑΝΠϧ֎͔ΒͷܧঝΛ૝ఆ w PQFODMBTT w BCTUSBDUDMBTT w USBJU w ಉҰιʔεϑΝΠϧ֎͔Βͷܧঝ΋Մೳ ܯࠂ  w DMBTT w ಉҰιʔεϑΝΠϧ֎͔ΒͷܧঝΛېࢭ ίϯύΠϧΤϥʔ  w TFBMFE w ܧঝΛېࢭ w pOBM

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&YQPSU w ҕৡΛ؆ศʹ͢Δػೳ w ͋ΔΦϒδΣΫτΛFYQPSU͢ΔͱɺΤΠϦΞεͷϝϯόʔ͕ࣗ ಈతʹ௥Ճ͞ΕΔ w class DontWantToExtendMe { def hello(name: String): String = s"Hello, ${name}!" } class Wrapper(dont: DontWantToExtendMe) { export dont._ // ্هͷexport͸ɺҎԼͱ౳Ձ // def hello(name: String): String = dont.hello(name) } val wrapper = new Wrapper(new DontWantToExtendMe()) println(wrapper.hello("world"))

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&YQPSU w FYQPSUͰɺଞͷϝϯόͱিಥ͢ΔͱίϯύΠϧΤϥʔ w class DontWantToExtendMe { def hello(name: String): String = s"Hello, ${name}!" } class Wrapper(dont: DontWantToExtendMe) { export dont._ def hello(name: String): String = s"Hello, ${name} from wrapper!" } [error] -- [E120] Duplicate Symbol Error: /Users/{my_path}/DottySandbox/src/main/scala/oop/ OpenClass.scala:13:16 [error] 13 | export dont._ [error] | ^ [error] | Double definition: [error] | def hello(name: String): String in class Wrapper at line 14 and [error] | final def hello(name: String): String in class Wrapper at line 13 [error] | have the same type after erasure. [error] one error found

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4DBMB΁ͷҠߦ

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4DBMB΁ͷҠߦ w 5IF3PBE5P4DBMB w 4DBMBͷޓ׵ੑ w ϚΠάϨʔγϣϯ w ࠓͰ͖Δ͜ͱ

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4DBMBͷόΠφϦޓ׵ੑ w 4DBMB͔Βɺ4DBMBͷʢϚΫϩҎ֎ͷʣόΠφϦΛར༻ Ͱ͖Δ w কདྷతʹɺ4DBMBͷόΠφϦ 5"45Z Λ4DBMB͔Β ར༻Ͱ͖ΔΑ͏ʹ͢Δ༧ఆ ࢀߟ  w ͞Βʹ4DBMBYܥͰ͸ɺ5"45ZʹΑΓόΠφϦޓ׵ੑ͕ҡ࣋ ͞ΕΔΒ͍͠  ʜࢀߟ w ඪ४ϥΠϒϥϦ JFίϨΫγϣϯ ͸4DBMBͰมߋͳ͠ w 4DBMBͷඪ४ϥΠϒϥϦΛར༻͢Δ

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4DBMBͷιʔεޓ׵ੑ w 4DBMBͷߏจͷେ෦෼͸ɺ4DBMBͰ΋ίϯύΠ ϧ͸Ͱ͖Δ w 4DBMBͰมߋ͞ΕͨߏจͰ͸ɺچߏจ͕ඇਪ঑ͱ ͳΔɻݱࡏɺچߏจͳͲΛܯࠂ͢ΔͨΊͷTUSJDUϑϥ ά͕༻ҙ͞Ε͍ͯΔɻ w ͢ͰʹͰඇਪ঑ͱͳ͍ͬͯΔߏจ΍ػೳ͸࡟আ͞Ε Δ

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4DBMBͷϚΫϩͷޓ׵ੑ w 5IF3PBE5P4DBMB8IBUBCPVUNBDSP  w ൈਮ5IFNBDSPTZTUFNGSPN4DBMBJTEFFQMZ UJFEUPUIFJOUFSOBMTPGUIF4DBMBDPNQJMFSBOE DBOOPUCFNJHSBUFEJOBDPNQBUJCMFGBTIJPOUP 4DBMB w ϚΫϩΛར༻͍ͯ͠ΔϥΠϒϥϦ͸ɺ4DBMB޲͚ʹॻ ͖׵͕͑ඞཁɻॻ͖׵͑πʔϧ౳ͷิॿ͸͓ͦΒ͘ͳ ͍ɻ 4DBMBίϯύΠϥͱͷີ݁߹ͷ͍ͤͰͰ͖ͳ͍

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ϚΠάϨʔγϣϯ w 4DBMBpYͷ׆༻͕த৺ͱͳΔ༧ఆ w 4DBMBҠߦͷͨΊʹ։ൃ͕࢝·ͬͨɺ੩తղੳʹΑΔ 3FXSJUFπʔϧ w 4DBMBpYࣗମ͸ɺ͞·͟ͳϓϩδΣΫτͰϓϩμΫγϣϯ౤ೖ ͞Ε͍ͯΔ w 4DBMBpY༻ͷ4DBMBSFXSJUFSVMF͸ɺ·ͩ͋·Γ࣮૷͞Εͯ ͍ͳ͍ ࣌఺  w 4DBMB$FOUFSओମͰɺSFXSJUFSVMFͷ࣮૷ʹऔΓ૊Ή༧ఆ

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ϚΠάϨʔγϣϯ w EPUDʹ΋SFXSJUFϑϥά͕༻ҙ͞Ε͍ͯΔ w 4JHOJpDBOU*OEFOUBUJPOͷॻ͖׵͑ʹར༻͞Ε͍ͯΔ w ࠓޙͲͷఔ౓׆༻͢Δͷ͔ɺ4DBMBpYͱͷ࢖͍෼͚͸ ෆ໌

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