Children in costumes standing in line.
A child hits his mother.
No mother standing in line children only
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & in(e1,x4) & n_line(x4) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_costume(x2) & n_child(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hit(e1) & n_mother(x2) & of(x2,x1) & n_male(x1) & n_child(x1))