Here was the original problem:
West leads 5♣️. North plays 4♣️. East plays 8♣️. And declarer (South) wins with Q♣️.
From the play to the first trick it looks like you can count on 11 tricks—three ♣️s, five ♠️s, two ♥️s, and one♦️. For a twelfth trick you could lead small from the South hand and finesse either Q♦️ or J♥️. Which finesse should you try ♦️s or ♥️s?
Solution–
To make your contract you only need one of the two red suit finesses to work. If you start with the ♦️ finesse and it loses you will still be able to regain the lead and try the ♥️ finesse. But if you start with the ♥️ finesse and it loses you will not be able to later finesse the Q♦️ because the defense will take the K♦️ for their setting trick. So, start by leading a small ♦️ toward the Q♦️.
Here was the entire deal:
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Patrick, how many tricks do you take before the final finesse? The five spades, and then do you take the clubs? If the diamond loses, East will return a club, if you have taken the two more clubs. before finessing.