People are sitting at square tables in a red room.
There's a blue room with round tables.
Tables cannot be both round and square.  The room is either red or blue.
exists e1 s1 s2 x1 x2 x3.(in(e1,x3) & n_room(x3) & a_red(s2) & Theme(s2,x3) & at(e1,x2) & n_table(x2) & a_square(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists p1 x1 s1 s2 x2 x3.((x1 = x2) & with(x2,x3) & n_table(x3) & a_round(s2) & Theme(s2,x3) & n_room(x2) & a_blue(s1) & Theme(s1,x2))