Two women sing as part of a rock group.
Two women skydiving.
singing and skydiving are different activities
exists e1 x1 x2 x3 x4.(as(e1,x2) & of(x2,x3) & n_group(x3) & of(x3,x4) & n_rock(x4) & n_part(x2) & Actor(e1,x1) & v_sing(e1) & n_woman(x1) & card_eq_2(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_skydive(e1) & (x1 = x2) & n_woman(x1) & card_eq_2(x1))