prop_logic_puzzle / example_num_vars6_depth9 /puzzle_0c461cd833eae3f7.txt
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new (A β†’ D ∧ E) β†’ (C β†’ (D ∧ B β†’ (D β†’ C) ∧ (B β†’ D)))
intro
intro
intro
cases 2
cases 2
constructor
intro
cases 2
exact 1
intro
cases 2
exact 3