SRL for [commitments]: At the same time , Viacom is trying to persuade stations to make [commitments] to `` A Different World , '' a spin - off of `` Cosby '' whose reruns will become available in 1991 .
ARG-0: stations | ARG-M-LVB: make | ARG-2: to `` A Different World , '' a spin - off of `` Cosby '' whose reruns will become available in 1991