Four boys play in the mud.
Four boys are outside.
The mud is found outside.
exists x1 x2 x3.(n_mud(x3) & a_topic(x1) & in(x1,x3) & n_play(x1) & of(x1,x2) & n_boy(x2) & card_eq_4(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_boy(x1) & card_eq_4(x1))