Predicate: challenge
Roleset id: challenge.01 , nom/nomadj-challenging, vncls:
Roles:
        Arg0: challenger
        Arg1: challenged (champion
        Arg2: challenged-to, heroic task
Example: autogen1
        thousands more staged protests in three other cities in a fresh
        challenge to the Communist leadership to introduce democratic
        freedoms
        Arg0 : thousands more
        ArgM-MNR : fresh
        Rel : challenge
        Arg1 : to the Communist leadership
        Arg2-PRD : to introduce democratic freedoms
Example: autogen2
        Her challenge is to keep her fledgling empire on top in the 1990s
        .
        Arg1 : Her
        Rel : challenge
        Arg2-PRD : to keep her fledgling empire on top in the 1990s