Predicate: source
Roleset id: source.01 , get, vncls: 13.5.1
Roles:
        Arg0: agent, entity acquiring something
        Arg1: thing acquired
        Arg2: source, gained from
        Arg3: beneficiary, gained for
Example: autogen1
        an important source of news for 60 million listeners in 23 exotic
        tongues : from Bulgarian and Belorussian to Kazakh and Kirghiz
        Arg2 : source
        Rel : source
        Arg1 : of news
        Arg3 : for 60 million listeners
Example: autogen2
        their main source of income
        Arg0 : their
        Arg2 : source
        Rel : source
        Arg1 : of income