dummy: AK74---A62---K75---863
you: J652---Q103--94--AK105.
Both vulnerable, you were the dealer, started the auction passing. LHO bid 1 diam (natural, 12-17, at least four, with 12-14 balanced at least five diam, at most four in any major), then your side bid for a while and finished with four spades. The first lead is CJ (natural). What is your plan?

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