Strength

4-cycles [green edges]
one-both, other-both, one-other
s(M(u),W(u,v))+s(M(v),W(u,v))+s(M(u),M(v))
4-cycles [cyan edges]
both-both
s(W(u,v))
3-cycles [yellow nodes in both]
|W(u,v)| / (|M(u)|+|M(v)|+|W(u,v)|)

20