People are sitting at square tables in a red room.
People are eating at a cafe.
Square tables in a red room does not necessarily mean it is a cafe.  People sitting at tables may or may not be eating.
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 e1 x1 x2.(at(e1,x2) & n_cafe(x2) & Actor(e1,x1) & v_eat(e1) & n_people(x1))