Three boys play in an unfinished building.
There are three boys
If boys play then it can be assumed that they are.
exists e1 s1 x1 x2.(in(e1,x2) & n_building(x2) & a_unfinished(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_3(x1))
exists p1 x1 x2.((x1 = x2) & n_boy(x2) & card_eq_3(x2))