A group of travelers are in an airport, waiting for something.
Humans waiting
Humans waiting refers to a group of travelers are in an airport
exists e1 p1 x1 x2 x3.(for(p1,e1) & for(e1,x3) & n_thing(x3) & Actor(e1,x1) & v_wait(e1) & exists x4.(in(x1,x4) & n_airport(x4)) & of(x1,x2) & n_traveler(x2) & n_group(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_human(x1))