#rectangle  a parallelogram with four right angles
  supertype:  #parallelogram  a quadrilateral whose opposite sides are both parallel and equal in length
  subtype:  #square__foursquare  (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon; "you can compute the area of a square if you know the length of its sides"
     subtype:  #quadrate  a square-shaped object
  subtype:  #box.rectangle  a rectangular drawing; "the flowchart contained many boxes"

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