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Summary
DescriptionFoibles of Boolean functions.svg
The parity related qualities of Boolean functions as vertices of a Fano plane
When three qualities are on the same line of the Fano plane, each of them is the XOR of the other two.
(The Fano plane has seven lines.)
The two strong edges mark twins. The others are their own twins.
I.e. an odious Boolean function has a sharp twin. The twin of an odd one is also odd.
See v:Equivalence classes of Boolean functions.
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