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- swap([[Xa,Ya],[Xb,Yb]]|Y],[[Xb,Yb],[Xa,Ya]|Y]) :- Xa>Xb.
- swap([[X,_]|Y1],[[X,_]|Y2]) :- swap(Y1,Y2).
- bbs(L,W) :- swap(L,L1), !, bbs(L1,W).
- bbs(L,L).
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