Two girls are eating on a bench.
a group of people eat in the sand.
a group of people can be more than two girls.  It can also include males.
exists e1 x1 x2.(on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_eat(e1) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_sand(x3) & in(e1,x3) & Actor(e1,x1) & v_eat(e1) & of(x1,x2) & n_people(x2) & n_group(x1))