A woman sitting with another woman looking at her phone.
The women are sisters.
One can not assume that two women sitting together are sisters.
exists e1 e2 x1 x2 x3 x4 x5.(a_topic(x1) & with(e1,x3) & at(e2,x5) & n_phone(x5) & of(x5,x1) & n_female(x1) & Actor(e2,x4) & v_look(e2) & (x3 = x4) & n_woman(x3) & -(x3 = x1) & n_woman(x1) & n_woman(x1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2))
exists p1 x1.(n_woman(x1) & exists x2.((x1 = x2) & n_sister(x2)))