Draw the Envelope Below is a drawing of an envelope with the
flap open. Grab your pencil and paper and try to draw it
yourself. Don't lift your pencil off the paper; the line must be
continuous. Don't go over any part of the line twice. Don't
cross the line. HintStart in a corner with an odd number of
lines. AnswerFollow the numbers 1, 2, ... 10. See another brain
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