A group of guys working as a group in a classroom.
Guys eating in dining area.
The guys can either be working in a classroom or be eating in dining area, but not both.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & in(e1,x5) & n_classroom(x5) & as(e1,x4) & n_group(x4) & Actor(e1,x3) & v_work(e1) & (x2 = x3) & n_guy(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_dine(e1) & n_area(x4) & (x1 = x3) & n_eating(x1) & (x1 = x2) & ne_nam_guys(x2))