prop_logic_puzzle / example_num_vars4_depth8 /puzzle_6d470f63be3fac5a.txt
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new ((A β†’ C) β†’ A) β†’ ((C ∨ A) ∧ C β†’ (C ∧ D β†’ ((A β†’ B) β†’ (C ∧ C) ∧ (D ∨ (D β†’ C)) ∨ A ∧ (D β†’ C))))
intro
intro
cases 1
intro
cases 4
intro
cases 1
cases 4
left
constructor
constructor
exact 3
exact 3
left
exact 6