Three women sitting and waiting for something on a bench.
The women are all sisters.
The relationship between the women could be something other than sisters.
exists e2 e1 x1 x2 x3 x4.(for(e2,x3) & on(x3,x4) & n_bench(x4) & n_thing(x3) & Actor(e2,x2) & v_wait(e2) & n_woman(x2) & card_eq_3(x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1) & card_eq_3(x1))
exists p1 x1.(n_woman(x1) & all x2.(n_sister(x2) -> (x1 = x2)))