A line of backpackers trekking across a very green, hilly landscape.
The people are in a backpacker club.
Backpackers are not assumed to be in a backpacker club.
exists e1 s1 s2 s3 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & across(e1,x4) & n_landscape(x4) & a_hilly(s3) & Theme(s3,x4) & a_,(s2) & Theme(s2,x4) & a_green(s1) & Theme(s1,x4) & r_very(x4) & Actor(e1,x3) & v_trek(e1) & (x2 = x3) & n_backpacker(x2) & n_line(x1))
exists p1 x1.(n_people(x1) & exists x2 x3.(in(x1,x2) & n_club(x2) & of(x2,x3) & n_backpacker(x3)))