A child playing with a sword at the bottom of the stairs.
A child playing with a spoon.
A child can either play with a sword or a spoon, not both.
exists x1 x2 x3 x4 x5.(n_stair(x5) & n_bottom(x4) & a_topic(x1) & at(x1,x4) & of(x4,x5) & with(x1,x3) & n_sword(x3) & n_playing(x1) & of(x1,x2) & n_child(x2))
exists x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_spoon(x3) & n_playing(x1) & of(x1,x2) & n_child(x2))