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Groote and Vaandrager introduced the tyft format, which is a congruence format for strong bisimulation equivalence. This article proposes additional syntactic requirements on the tyft format, extended with predicates, to obtain a precongruence format for language preorder.doi:10.1016/s0304-3975(98)00267-9 fatcat:mpqnucatsjdazjug46o3vxqlsa