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Any non-square rhombus. From Wikipedia:

Every rhombus is a parallelogram, and a rhombus with right angles is a square. (Euclid's original definition and some English dictionaries' definition of rhombus excludes squares, but modern mathematicians prefer the inclusive definition.)

(And as long as you're just talking about the length of those sides -- which is the only sensible interpretation of the question -- it's clearer to call them "equal" than "congruent".)

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Q: What has Four congruent sides but not a square?
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