prop_logic_puzzle / example_num_vars4_depth9 /puzzle_01b7093cfd6be5fb.txt
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new B ∨ A β†’ (A β†’ (B β†’ ((A β†’ B) β†’ ((((B ∨ C) ∧ (A ∨ B)) ∧ A ∨ (D ∨ B ∧ A)) ∨ B) ∧ B)))
intro
intro
intro
intro
constructor
left
left
constructor
constructor
left
exact 2
left
exact 1
exact 1
exact 2