A child in a pool wearing water-wings.
The child is riding a tricycle.
One cannot be riding a tricycle and be in a pool at the same time.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_water-wing(x4) & (x2 = x3) & n_pool(x2) & n_child(x1))
exists e1 x1 x2.(n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_tricycle(x2))