A punk rocker screaming on stage at concert.
A rock group is performing tonight.
The punk rocker screaming on stage may not be a part of a rock group.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & at(e1,x5) & n_concert(x5) & on(e1,x4) & n_stage(x4) & Actor(e1,x3) & v_scream(e1) & (x1 = x3) & n_rocker(x1) & of(x1,x2) & n_punk(x2))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_tonight(x3) & n_group(x1) & of(x1,x2) & n_rock(x2))