# Zucca's Challenge Problem for Extrominoes

Livio Zucca's
Tetrominoes
Challenge Page challenges you to find plane regions
that can be tiled with each of a given set of tetrominoes and no others.
Here I show solutions to the corresponding
problem for *extrominoes,* or extended trominoes—figures
formed by joining three
equal squares orthogonally at edges or corners.
They are also called *trikings* and *triplets.*
If you find a smaller solution for any of these sets, please
let me know.

See also Zucca's Challenge
Problem for Tetrahexes and
Zucca's Challenge
Problem for Polyiamonds.

The results below are Erich
Friedman's except where noted otherwise.

*Last revised 2015-11-06.*

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Col. George Sicherman
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