Children posing in a tree
Elderly people are skydiving
There can either be children or elderly.
exists e1 x1 x2.(ne_nam_children(x1) & in(e1,x2) & n_tree(x2) & Actor(e1,x1) & v_pose(e1))
exists e1 s1 x1.(Actor(e1,x1) & v_skydive(e1) & n_people(x1) & a_elderly(s1) & Theme(s1,x1))