A group of people are riding on a tour bus and viewing something interesting out the window.
People are looking out the window.
A group of people ar people, while  looking and viewing are interchangeable.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_window(x9) & Theme(e2,x7) & Actor(e2,x5) & v_view(e2) & out(s1,x9) & Theme(s1,x8) & a_interesting(s1) & (x7 = x8) & n_thing(x7) & of(x5,x6) & n_people(x6) & n_group(x5) & on(e1,x3) & n_bus(x3) & of(x3,x4) & n_tour(x4) & Actor(e1,x1) & v_ride(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(n_window(x2) & out(e1,x2) & Actor(e1,x1) & v_look(e1) & n_people(x1))