prop_logic_puzzle / example_num_vars4_depth9 /puzzle_53c4148eb0e8b249.txt
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new ((B β†’ C) β†’ A) β†’ (D β†’ (B β†’ (A ∧ (C ∧ A) β†’ (A β†’ D ∨ D) ∨ A) ∨ (D β†’ B)))
intro
intro
intro
left
intro
cases 3
cases 3
cases 5
cases 7
left
intro
cases 3
cases 5
cases 7
cases 14
left
exact 1