An instance of Cyc argument entry format (q.v.) that can be specified to hold of a given predicate with respect to a given argument-place (see Arg Format). (Arg Format PRED N set argument entry format) means that, for any particular way of fixing the other arguments to PRED besides the Nth, there might be any number (including zero) of things such that, if taken as the Nth argument, PRED holds of those arguments. For example, the format of biological mother's first argument-place is set argument entry format, since a female animal might have any number of offspring. Unlike the other reified instances of Cyc argument entry format, set argument entry format actually places no restriction at all on what PRED might or might not hold of with respect to the relevant argument-place. But one should not infer from this that entry-format assertions using set argument entry format are pointless; for they forestall duplication of effort by serving notice that the entry-format of a given argument-place has previously been considered and set argument entry format was deemed the appropriate format. set argument entry format is the most commonly-encountered format in the Cyc Knowledge Base. Contrast with single-entry format.