2D shapes

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Across
  1. 2. I have 4 sides, they are not equal.
  2. 4. I have no sides and no edges.
  3. 5. I have 6 sides.
  4. 6. I have 5 sides.
Down
  1. 1. I have 4 EQUAL sides.
  2. 3. I have 3 sides.