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- isBlack(X):-X=x.
- wx([[L1,_],[_,L4]|_]):- isBlack(L1),isBlack(L4).
- wx([[_,L2],[L3,_]|_]):- isBlack(L3),isBlack(L2).
- wx([[L1,P1|T],[_,L4|T1]|Tl]):- isBlack(L1),isBlack(L4),wx([[P1|T],[L4|T1]|Tl]).
- wx([[_,L2|T],[L3,P1|T1]|Tl]):- isBlack(L3),isBlack(L2),wx([[L2|T],[P1|T1]|Tl]).
- wx([[_,_|_],[L,L1|T1]|T]):- wx([[L,L1|T1]|T]).
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