prop_logic_puzzle / example_num_vars4_depth6 /puzzle_836462cda64771e6.txt
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new C ∧ D β†’ ((C β†’ A) β†’ ((A β†’ C ∧ B) β†’ ((C β†’ B) β†’ A)))
intro
cases 0
intro
intro
intro
cases 0
apply 3
exact 1