A boy does a flip while another boy stands on the Matt.
A boy does a gymnastic routine.
If a boy does a flip, it doesn't mean he does a gymnastic routine.
exists e1 p1 x1 x2 x4.(ne_geo_matt(x4) & exists e2 x3.(on(e2,x4) & Actor(e2,x3) & v_stand(e2) & n_boy(x3) & -(x3 = x1)) & n_boy(x1) & n_boy(x1) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_flip(x2))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_routine(x2) & a_gymnastic(s1) & Theme(s1,x2) & n_boy(x1))