There are six singers: F, G, L, K, H, M. Three piano accompaniment: X, Y, W. Each piano accompanist happens to accompany two of the singers. The known conditions are as follows: (1) if X accompanies F, W accompanies L. (2) if X does not accompany G, Y accompanies M. (3) X or Y to accompany H. (4) F and G do not share the same accompanist; L and K do not share the accompanist; H and M do not share the accompanist.
 G and H is the most unlikely singer for Y to accompany.