Children are splashed with water.
Children are throwing sand at each other.
There is no sand involved when splashing water.
exists e1 x1 x2.(with(e1,x2) & n_water(x2) & Theme(e1,x1) & v_splash(e1) & n_child(x1))
exists e1 x1 x2.(all x3.(n_other(x3) -> at(e1,x3)) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_sand(x2) & n_child(x1))