prop_logic_puzzle / example_num_vars4_depth11 /puzzle_5a76990144d10e65.txt
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new ((A β†’ B) β†’ D) β†’ (C β†’ (B β†’ (A β†’ D ∧ ((A ∨ (C β†’ C)) ∧ A))))
intro
intro
intro
intro
constructor
apply 0
intro
exact 2
constructor
left
exact 3
exact 3