WMC 2018 Senior Problem 28
Level
2
You are to add another square to this diagram, placed orthogonally adjacent to one or more existing squares. How many of the possible new shapes have one or both of rotational or reflection symmetry?
4
0
1
2
3
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1 solution
Put the new square at the top of the middle column, or at either of the two spaces below the rightmost square.