Definition: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Input: Sentence: 'Serving Illinois cities such as Chicago , Oak Park , Park Ridge , Orland Park , Calumet City , Skokie , Evanston , Cicero , Berwyn , Des Plaines , Schaumburg , Bridgeview , Wheaton , Waukegan , Bolingbrook , Joliet , Naperville , Aurora , Elgin , Downers Grove , and Buffalo Grove .', Argument/Subject 1: 'chicago', Argument/Subject 2: 'illinoi'
Output:
be city of