People play with pyrotechnics.
Children play with a spark plug.
People  do not play with pyrotechnics and spark plug at the same time.
exists e1 x1 x2.(with(e1,x2) & n_pyrotechnics(x2) & Actor(e1,x1) & v_play(e1) & n_people(x1))
exists e1 s1 x1 x2.(with(e1,x2) & n_plug(x2) & a_spark(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))