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Polyabolo
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==Tiling a common figure with various polyaboloes== [[Image:Bolo4kv.svg|A minimal compatibility figure for the K and V tetraboloes.|thumb|right]] The ''Compatibility Problem'' is to take two or more polyaboloes and find a figure that can be tiled with each. This problem has been studied far less than the Compatibility Problem for polyominoes. Systematic results first appeared in 2004 on Erich Friedman's website Math Magic.<ref>{{cite web |last1=Friedman |first1=Erich |title=Polypolyforms|url=https://erich-friedman.github.io/mathmagic/0904.html |website=Math Magic}}</ref>
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