prop_logic_puzzle / example_num_vars4_depth9 /puzzle_021847eae70ba226.txt
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new ((B β†’ C) β†’ B) β†’ ((D ∨ B β†’ B) β†’ (((B β†’ C) β†’ D) β†’ (A ∧ B β†’ (B ∧ A) ∧ A)))
intro
intro
intro
intro
cases 3
cases 3
constructor
constructor
exact 5
exact 4
exact 4