Predicate: substitute
Roleset id: substitute.01 , exchange one thing for another, vncls: 13.6
Roles:
        Arg0: agent, entity trading
        Arg1: thing being preferred, new thing
        Arg3: other item in exchange, old thing
        Arg4: beneficiary
Example: autogen1
        their own substitutes
        Arg0 : their
        Arg1 : substitutes
        Rel : substitutes
Example: autogen2
        a potential substitute for CFCs
        Arg1 : substitute
        Rel : substitute
        Arg3 : for CFCs