A group of people riding on a crowded bus.
The bus was full.
Not all crowded buses are full
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & on(e1,x4) & n_bus(x4) & a_crowded(s1) & Theme(s1,x4) & Actor(e1,x3) & v_ride(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists s1 x1.(n_bus(x1) & Theme(s1,x1) & a_full(s1))