A girl plays in a small pool.
A girl is playing in the sandbox.
One cannot be playing in a pool and a sandbox simultaneously.
exists e1 s1 x1 x2.(in(e1,x2) & n_pool(x2) & a_small(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_girl(x1))
exists e1 x1 x2.(n_sandbox(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_girl(x1))