shithub: puzzles

ref: f01b1674bd862e1792b5216bd5d832cd52a170ae
dir: /html/sixteen.html/

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Sixteen
<p>
Slide the grid squares around so that the numbers end up in
consecutive order from the top left corner.
<p>
Click on the arrows at the edges of the grid to move a row or column
left, right, up or down. The square that falls off the end of the
row comes back on the other end.