Three people squat down on the edge of a lake.
a concrete lot sits empty
The edge of a lake is not a concrete lot. If there's three people it's not empty.
exists e1 s1 x1 x2 x3.(n_edge(x2) & a_down(s1) & Manner(e1,s1) & on(e1,x2) & of(x2,x3) & n_lake(x3) & Actor(e1,x1) & v_squat(e1) & n_people(x1) & card_eq_3(x1))
exists e1 p1 s1 x1.(exists s2.(Theme(s2,x1) & a_empty(s2)) & Topic(e1,p1) & Actor(e1,x1) & v_sit(e1) & n_lot(x1) & a_concrete(s1) & Theme(s1,x1))