A group of people sitting at long tables.
People sitting around tables.
A group of people is the same as people.  People sitting at tables is the same as sitting around tables.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & at(e1,x4) & n_table(x4) & a_long(s1) & Theme(s1,x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(a_topic(x1) & around(e1,x3) & n_table(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))