A small boy climbing a backyard play set.
There is a group of kids playing in the play set.
A small boy cannot be referred to as a group of kids.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x1) & v_set(e2) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & n_play(x3) & of(x3,x4) & n_backyard(x4) & (x1 = x2) & n_boy(x1) & a_small(s1) & Theme(s1,x1))
exists p1 x1 x6.(n_play(x6) & exists e1 x2 x3 x4 x5.((x1 = x2) & of(x2,x3) & in(e1,x6) & Theme(e1,x5) & Actor(e1,x4) & v_play(e1) & n_set(x5) & (x3 = x4) & n_kid(x3) & n_group(x2)))