A group of people walking between two buildings.
A group of students follow the tour guide.
We cannot assume that the group of people is a group of students.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & between(e1,x4) & n_building(x4) & card_eq_2(x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_guide(x3) & of(x3,x4) & n_tour(x4) & Theme(e1,x3) & Actor(e1,x1) & v_follow(e1) & of(x1,x2) & n_student(x2) & n_group(x1))