Previous bidding:

and  values

3+card

3-card ♠

wants to play NT contract

fit, no  values

no  values, offers to play in ♠

any strength

any strength

any strength

~15-17 HCP (3.75-4.25 HT)

~15-17 HCP (3.75-4.25 HT)

~15-17 HCP (3.75-4.25 HT)

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