a group of people sitting on the ground on the sidewalk
A group of friends are sitting at a picnic table
The people can either be on the ground or at a picnic table.
exists e1 x1 x2 x3 x4 x5.(n_sidewalk(x5) & n_ground(x4) & a_topic(x1) & of(x1,x2) & on(e1,x4) & on(x4,x5) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(at(e1,x3) & n_table(x3) & of(x3,x4) & n_picnic(x4) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_friend(x2) & n_group(x1))