prop_logic_puzzle / example_num_vars5_depth9 /puzzle_3e5a79d65f3cd147.txt
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new D ∨ C β†’ (D ∧ A β†’ (C ∨ E β†’ (B β†’ (D ∨ A β†’ D))))
intro
intro
cases 1
intro
intro
intro
cases 1
exact 2