Four people are walking along a city sidewalk, while the one in the green hat talks on a cellphone.
A group of friends walks along the sidewalk.
A group of friends is people.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_talk(x4) & of(x4,x5) & n_hat(x5) & a_green(s1) & Theme(s1,x4) & in(e1,x4) & on(x4,x6) & n_cellphone(x6) & while(e1,x1) & n_thing(x1) & card_eq_1(x1) & along(e1,x2) & n_sidewalk(x2) & of(x2,x3) & n_city(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1) & card_eq_4(x1))
exists e1 x1 x2 x3.(n_sidewalk(x3) & along(e1,x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_friend(x2) & n_group(x1))