Two skinny young boys playing with sand in the water.
Two boys play at a racetrack.
Boys can't play at the racetrack if they are in the water.
exists e1 s1 s2 x1 x2 x3 x4.(n_water(x4) & a_topic(x1) & in(e1,x4) & with(e1,x3) & n_sand(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & a_young(s2) & Theme(s2,x1) & a_skinny(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(at(e1,x2) & n_racetrack(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_2(x1))