You are down 16 at the half of a K.O. match - early in the second half this swingy-looking hand is dealt. How do you procede? Do you have agreements to cover continuations here? Would 4C be a cue bid or black suits? Does 4D confirm hearts as trumps or does that show the blacks? Does partner's 3H show a minimum and does it deny 4/4 in the majors?
Where do you go from here?

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W N E S
2D X P 3D
P 3H P ?
2D-natural and weak.