prop_logic_puzzle / example_num_vars4_depth10 /puzzle_38aebb824bb1b8df.txt
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new ((A β†’ D) β†’ D) β†’ (C β†’ ((B β†’ C ∧ D) β†’ ((C β†’ (C β†’ B)) β†’ (C ∨ B) ∧ B ∨ (C ∧ A β†’ A))))
intro
intro
intro
intro
right
intro
cases 4
cases 4
exact 6