Lead the 10. If West plays the 5 or 6, let it ride. If West
plays the Q, J, or 9, win the ace and lead back toward your
hand covering whatever East plays.

This works against the Q, J or 9 singleton on your left, and
also picks up singleton 9 on your right! You can't do
anything about a singleton Q, J, 6 or 5 on your right or
singleton 5 or 6 on your left.

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