A man lecturing a group of people in a medium sized room.
There are people listening to a man speak.
Man lecturing a group of people and people listening to a man speak are same action.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x5) & n_room(x5) & a_sized(s2) & Theme(s2,x5) & a_medium(s1) & Theme(s1,x5) & Theme(e1,x3) & Actor(e1,x2) & v_lecture(e1) & of(x3,x4) & n_people(x4) & n_group(x3) & (x1 = x2) & n_man(x1))
exists e1 p1 x1 x2.(Actor(e1,x1) & v_speak(e1) & exists e2 x3 x4 x5.((x2 = x3) & to(e2,x5) & n_man(x5) & Actor(e2,x4) & v_listen(e2) & (x3 = x4) & n_people(x3)) & (x1 = x2))