A small boy and small girl setting up a camera
The boy and girl are siblings.
Not all pairs of children are siblings
exists e1 s1 s2 s3 s4 x1 x2 x3 x4.(a_topic(s1) & a_up(s4) & Manner(e1,s4) & Theme(e1,x4) & Actor(e1,x3) & v_set(e1) & n_camera(x4) & (s1 = x3) & n_girl(x2) & a_small(s3) & Theme(s3,x2) & n_boy(x1) & subset_of(x2,s1) & subset_of(x1,s1) & a_small(s2) & Theme(s2,s1))
exists p1 x1 x2 x3.(n_girl(x3) & n_boy(x2) & subset_of(x3,x1) & subset_of(x2,x1) & exists x4.((x1 = x4) & n_sibling(x4)))