This is a book., No,it isn't., Yes, it is., This is a pen., No,it isn't., Yes, it is., This is a ruler., Yes, it is., No,it isn't., This is a notebook., No,it isn't., Yes, it is., This is paper., No,it isn't., Yes, it is., This is a desk., Yes, it is., No,it isn't.

This is...

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