A group of people are riding bikes across a bridge.
the people are women
Not all groups of people are women.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & across(x3,x4) & n_bridge(x4) & n_bike(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1.(n_people(x1) & exists x2.((x1 = x2) & n_woman(x2)))