Solve the riddle: I am a polygon. I have two right angles. I have only one pair of parallel sides. What am I?

A trapezoid, or any number of other polygons. A trapezoid is the polygon with the fewest sides fitting the criteria, however there are multiple polygons which suffice (since it was not specified that the polygon must be regular). A few examples should show how to generate a polygon with any number of sides what has two right angles and a single pair of parallel sides.

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