?-?
better(P1,V1,_,V2,P1,V1, CurrentPos):-
max(CurrentPos),
V1>V2, !.
better(P1,V1,_,V2,P1,V1, CurrentPos):-
min(CurrentPos),
V1<V2, !.
better(_,_,P2,V2,P2,V2,_).
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