A group of people sitting on a couch sipping drinks.
The group of people are having a beer guzzling contest.
the group cant be guzzling and sipping drinks at the same time.
exists e1 e2 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & on(e1,x4) & n_drink(x4) & Actor(e2,x4) & v_sip(e2) & of(x4,x5) & n_couch(x5) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 e2 x1 x2 x3 x4.(n_group(x1) & Theme(e2,x3) & Actor(e2,x1) & v_have(e2) & n_contest(x3) & Actor(e1,x3) & v_guzzle(e1) & of(x3,x4) & n_beer(x4) & of(x1,x2) & n_people(x2))