I have not more than 4 tricks in ♣s and ♠s, so I need at least 5 tricks in ♦s and ♥s. I can play ♥s, but if that's wrong it may be too late to turn to ♦s. Actually if I play ♦s and ♣s first, then I might endplay someone with the 3rd round of ♥s, to play a ♠. So the basic line is win ♣K and play ♣T (duck in the dummy). Say LHO leads a heart, win in hand, finesse the ♣, another ♣ (discarding a ♠) and finesse the ♦9. If succesfull I finesse ♦ after a ♠ to the king. If LHO wins the ♦9, I will cash my ♦ and ♥ winners and exit with the 3rd ♥.