true sentence. For example, #$biologicalMother is functional in its second argument, as nothing has more than one biological mother. In most cases, the entry-format (see #$Format) of a functional argument-place should be #$singleEntryFormatInArgs (q.v.). In some cases, however, the entry-format is #$intervalEntryFormatInArgs (q.v.), and then the meaning of (#$functionalInArgs PRED N) deviates slightly from that described above. In such a case there might be more than one instance of #$ScalarInterval (q.v.) 