Predicate: precondition
Roleset id: precondition.01 , need, vncls:
Roles:
        Arg0: requirer
        Arg1: thing required
        Arg2: required-of, required-from ('ablative
Example: autogen1
        the U.S. precondition for a direct `` dialogue '' with the PLO
        Arg0 : U.S.
        Rel : precondition
        Arg1 : for a direct `` dialogue '' with the PLO