West leads K♦.East cashes with A ♦and returns ♠,South puts 10♠,west discards ♦.East has 5 cards in♠ but as he doesn't return ♦ we presume that his A♦ is single.As we know now that in the beginning east has 5♠ and single A♦ we should not go down.
The situation is:
How?

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