A redhead is singing with a backup group on stage.
A redhead sleeping on stage.
A redhead can���t be sleeping and singing at the same time.
exists e1 s1 x1 x2 x3.(with(e1,x2) & on(x2,x3) & n_stage(x3) & n_group(x2) & a_backup(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sing(e1) & n_redhead(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_stage(x3) & Actor(e1,x2) & v_sleep(e1) & (x1 = x2) & n_redhead(x1))