A group of women are sitting around tables.
The group of women are sitting on chairs around the table.
The women have to be sitting on something if they're at a table, so they must be sitting on chairs.
exists e1 x1 x2 x3.(around(e1,x3) & n_table(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_woman(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_table(x4) & n_group(x1) & on(e1,x3) & around(x3,x4) & n_chair(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_woman(x2))