Word Square

Today's handy dandy time-waster. Ready to play?? Here we go!

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Fill in the following word square so that each word can be read across and down.

C O S T
O * * *
S * * *
T * * *

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Okay, that's pretty straightforward. And like always, the answers will be found later in the comments.

Update: I have very smart readers. : ) Today's Smartypants are Rachel from Pereiraville, Rich Blank, and Judy from The Funny Farm. Whoohoo!