The general challenge posed is to tile a given region with a given set of polyominoes.
TL;DR
GAs aren't the most appropriate tool for this kind of puzzle. GAs tend to produce good but sub-optimal solutions and this behaviour is acceptable only for some combinatorial optimization problems.
Anyway the last example proposed finds a solution almost always (often in a short time) and GAs prove themselves a general, viable path especially when previous knowledge isn't available.
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