Duck
North's Opening lead of 2♥ shows he holds only 4 hearts. Declarer can not afford to lose 2 tricks in ♥, one in ♦ and 2 in ♣. He therefore must duck one round of ♥ to have any chance of making his contract.
Declarer can cash Dummy's ♣ winners by ducking two rounds of ♣s first, leading Q♣ in the first round !
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