A young boy is standing near another doing a back flip.
Two young girls doing cartwheels.
The subjects are either a boy and another boy or two girls.  A back flip and cartwheels are not the same.
exists e2 e1 s1 s2 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_do(e2) & n_flip(x3) & a_back(s2) & Theme(s2,x3) & near(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_stand(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_cartwheel(x3) & (x1 = x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))