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If dog plus dog = dog why does dog plus dog = cat

INTO JAPANESE

犬と犬=犬の場合、なぜ犬と犬=猫なのか

BACK INTO ENGLISH

If dog and dog = dog, why dog and dog = cat

INTO JAPANESE

犬と犬=犬の場合、なぜ犬と犬=猫なのか

BACK INTO ENGLISH

If dog and dog = dog, why dog and dog = cat