prop_logic_puzzle / example_num_vars5_depth8 /puzzle_6143fe4705f5e48f.txt
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new (A ∨ E β†’ B) β†’ ((A β†’ D) β†’ (A ∧ E β†’ (A ∧ C β†’ D)))
intro
intro
intro
cases 2
intro
cases 5
cases 2
cases 5
apply 1
exact 3