Group of people wearing backpacks looks at a map.
The backpacks are blue.
Not all backpacks are blue.
exists e2 e1 x1 x2 x3 x4 x5.(ne_org_group(x1) & at(e2,x5) & n_map(x5) & Actor(e2,x1) & v_look(e2) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_backpack(x4) & (x2 = x3) & n_people(x2))
exists s1 x1.(n_backpack(x1) & Theme(s1,x1) & a_blue(s1))