Proof of something like a Deduction Theorem in Strong K3 Logic.

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Does anyone know if there is a proof of something like a Deduction Theorem in Strong K3 Logic? I am only interested in one direction of the usual biconditional; that is: {X,A}⊨B ⇒ {X}⊨(A→B)

If there are any articles/chapters, please let me know.