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25.1.2 ²þ̾¤Ë¤è¤ë¥Ð¥Ã¥¯¥¢¥Ã¥×¤«¥³¥Ô¡¼¤Ë¤è¤ë¥Ð¥Ã¥¯¥¢¥Ã¥×¤«

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Variable: backup-by-copying

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Variable: backup-by-copying-when-linked

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Variable: backup-by-copying-when-mismatch

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