E deals and opens 1♠, what do you bid and does vulnerability make any difference ?
Your lead:
First case, partner deals and opens a precision (0+ cards) diamond, S bids 3N to play ending the auction
Second case, partner opens a 3+ card diamond, S overcalls 2♣, you bid 2♥ (NF), N bids 2♠, E passes and S bids 5♣ ending the auction.

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