prop_logic_puzzle / example_num_vars4_depth9 /puzzle_104b5e8b1f356892.txt
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new A ∧ B β†’ (C β†’ (C ∧ A β†’ (((B β†’ A) β†’ D) β†’ A ∨ B)))
intro
cases 0
intro
intro
cases 4
intro
cases 0
cases 4
left
exact 1