prop_logic_puzzle / example_num_vars4_depth9 /puzzle_67d5cafa281e61b5.txt
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new (C β†’ A) β†’ (B β†’ (((B β†’ A) β†’ D) β†’ ((C β†’ A) β†’ C ∨ ((A β†’ C) β†’ (C β†’ B)))))
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exact 1