Four elementary-aged children, two boys and two girls, play on a green lawn with a tree and a building in the background.
Two sets of twins are playing.
four children don't have to be twins
exists s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11.(n_background(x11) & a_topic(x1) & rel(x1,x3) & subset_of(x5,x3) & rel(x5,x6) & on(x6,x7) & with(x7,x8) & subset_of(x10,x8) & in(x10,x11) & n_building(x10) & subset_of(x9,x8) & n_tree(x9) & n_lawn(x7) & a_green(s2) & Theme(s2,x7) & n_play(x6) & n_girl(x5) & card_eq_2(x5) & subset_of(x4,x3) & n_boy(x4) & card_eq_2(x4) & n_child(x1) & a_elementary-aged(s1) & Theme(s1,x1) & (x1 = x2) & ne_nam_four(x2))
exists e1 x1 x2.(Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_twin(x2) & n_set(x1) & card_eq_2(x1))