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I'm not sure why this is wrong. Could someone explain it to me?

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  • One of the L shapes you've accounted for is backwards. – Vemonus Mar 22 '17 at 0:32
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    @Vemonus how so? all 3 of them would be correct if they can be rotated (the middle one is 180 degrees rotated of the top one, the bottom one 90 degrees counter-clockwise of the middle) – Memor-X Mar 22 '17 at 0:44
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    The top left is correct, but the one directly attached to it. That one is backwards. All of the shapes you're given are backwards Ls, but that one accounts for a forwards L. – Vemonus Mar 22 '17 at 0:45
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    The straight 4 is wrong, see related question: gaming.stackexchange.com/questions/255540/… – Angzuril Mar 22 '17 at 1:16
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The section with the tetris-pieces is incorrect. That would only work if the straight-piece could be rotated (it can't) or if the backwards-L-shapes could be mirrored (they can't)

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  • This solution doesn't require mirroring of the L shapes, they are all backwards Ls. – Austin Mar 22 '17 at 4:21
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    @Austin: Yes, it does require either mirroring one of the L's, or rotating the straight-piece. Unless your point was just to be pedantic about the piece-names, in which case, I'll update the answer... – BlueRaja - Danny Pflughoeft Mar 22 '17 at 6:14
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    Sorry, I read your statement as 'and', and didn't notice the arrangement that needs forwards L. – Austin Mar 22 '17 at 22:45

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