prop_logic_puzzle / example_num_vars7_depth6 /puzzle_3910a8a851258fda.txt
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new D ∨ B β†’ (B β†’ (D β†’ ((D ∨ C β†’ C) β†’ (B β†’ D ∧ (G β†’ G ∨ G)))))
intro
intro
intro
intro
intro
constructor
exact 2
intro
left
exact 5