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Is there a simple proof that any square besides a 3x3 square with area divisible by 3 is tileable with L-trominos?

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  • $\begingroup$ All such squares have an edge length which is a aum of 6es and 9s, so it suffices to exhibit tilings of the $6\times6 $ and the $9\times 9$ squares. $\endgroup$ – MJD Aug 28 '14 at 23:30
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    $\begingroup$ ... and of the $9 \times 6$ rectangle. $\endgroup$ – Robert Israel Aug 28 '14 at 23:38

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