fact: Definition PCPf' Q P s t := encode_pair (encode_pair (encode_list encode_word_pair Q) (encode_list encode_word_pair P)) (encode_pair s t).
imports: List Lia ssreflect ssrbool ssrfun Undecidability.HilbertCalculi.HSC Undecidability.HilbertCalculi.Util.HSCFacts Undecidability.PCP.PCP