Consider the following auctions. What do you think partner has in each of them and what is your call?
(1)
(P) - P - (1♠) - X
(XX) - 2♣ - (P) - P
(X) - XX - (P) - ?
(2)
(P) - P - (1♠) - X
(XX) - 2♣ - (X) - P
(P) - XX - (P) - ?
(3)
(P) - P - (1♠) - X
(XX) - 2♣ - (P) - 3♣
(X) - XX - (P) - ?
(4)
(P) - P - (1♠) - X
(XX) - 2♣ - (X) - 3♣
(X) - XX - (P) - ?

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