Question 647858
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All squares are parallelograms. 
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Negation: There exists at least one square which is not a parallelogram. 
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No squares are parallelograms. 
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Negation: There exists at least one square which is a parallelogram.
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Some squares are parallelograms.
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Negation:  No square is a parallelogram.
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Some squares are not parallelograms. 
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Negation: All squares are parallelograms.

Edwin</pre>
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