Mothers tend to their children at a picnic table.
People at a picnic table.
Mothers and children are people.
exists e1 x1 x2 x3 x4.(to(e1,x2) & at(x2,x3) & n_table(x3) & of(x3,x4) & n_picnic(x4) & n_child(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_tend(e1) & n_mother(x1))
exists x1 x2 x3.(a_topic(x1) & at(x1,x2) & n_table(x2) & of(x2,x3) & n_picnic(x3) & n_people(x1))