Sorry, but there is nothing yet known as a replacement for pentominoes.

Maybe some reasonable answers will be found next time you come.

Your alternative for pentominoes is not listed? Suggest!

Speaking about pentominoes, one probably shouldn't forget about rotational symmetry.

Other search terms related to pentominoes and their ratings are:

★★★★★	rotational symmetry
★	line symmetry

You have in mind a companion for pentominoes and it is not yet here? Propose!

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