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Theorem challenge3

r ≠ null, (tr(r, t) * P)(H), bst(t) ⊦ 〈search_tree_delete_min(; a, r, H)〉 ((tr(r, t .butleftmost) * P * true)(H) ∧ bst(t .butleftmost) ∧ a = t .leftmost ∧ ¬ a ∈ t .butleftmost ∧ (∀ b. b ∈ t .butleftmost → a < b))

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