YOU SAID:

what if there were no more turtles

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それ以上のカメがいなかったら

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If there were no more turtles

INTO JAPANESE

それ以上のカメがなければ

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Without any further turtles

INTO JAPANESE

それ以上のカメなし

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No more turtles

INTO JAPANESE

もはやカメはない

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There is no longer a turtle

INTO JAPANESE

もはやカメはありません

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There is no longer a turtle