Few are those who are respecting the rules (palette) judging by the random previews colors 
Edit: maybe not all that bad after all. At least 3 pieces do have the wrong colors or more than 2, but others I thought were wrong are in fact ok, the issue being the dreadful png-f'ing browser thing. Didn't check all, only the suspicious cases.
My mistake, I read it fast and I missed the fact it was optional. 
Few are those who are respecting the rules (continuing line) :(
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