prop_logic_puzzle / example_num_vars4_depth6 /puzzle_2204acbb7545d332.txt
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new B ∨ A β†’ (((C β†’ A) β†’ D) β†’ (A β†’ ((A β†’ A) ∨ (D ∧ A β†’ C ∧ A)) ∨ (C ∨ C ∧ C)))
intro
intro
intro
left
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exact 2