Since a quadrilateral is a defined as any object with two sets of two parallel lines that form four 90 degree right angles. It would have 2 sets of 2 parallel lines.
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A square has two pairs of parallel sides.It has two pairs of parallel sides.
It has 2 pairs of parallel sides
A parallelogram has two pairs of parallel sides.
A parallelogram has two pairs of opposite parallel sides
A parallelogram has 2 pairs of parallel sides