What seems to be the answer?!

Question: What seems to be the answer!?

I come in different shapes and sizes!. Part of me are curves, others are straight!. You can put me anywhere you like, but there is only one right place for me!.
What am I!? Www@Enter-QA@Com

Answers:

idk a puzzle pieceWww@Enter-QA@Com

puzzle pieceWww@Enter-QA@Com

a word!?Www@Enter-QA@Com

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What seems to be the answer?!

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