A group of girls are cheering.
A group of cheerleaders are cheering at a game.
Girls can be cheerleading without being cheerleaders or even at a game, for instance, at a play or a concert.
exists e1 x1 x2.(Actor(e1,x1) & v_cheer(e1) & of(x1,x2) & n_girl(x2) & n_group(x1))
exists e1 x1 x2 x3.(at(e1,x3) & n_game(x3) & Actor(e1,x1) & v_cheer(e1) & of(x1,x2) & n_cheerleader(x2) & n_group(x1))