Box Puzzle Brain Teaser One-Line only?

Picture or draw a rectangle box. Draw a horizontal line through the box. Draw 2 vertical lines on the first half of the box (top-half). Draw 1 vertical line between the 2 vertical lines you have drawn.

Now here's the question.

Draw one line crossing 16 lines of the box without crossing each line twice.

I've done this many times, and it always ends up looking like a duck.
HOpefully you can solve the case!
Good luck!
 
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