A girl in a white dress walks next to a girl in a blue dress.
Nobody is walking.
If nobody is walking then there is no girl walking next to another girl.
exists e1 p1 s1 x1 x2.(exists s2 s3 x3 x4.(to(s2,x3) & in(x3,x4) & n_dress(x4) & a_blue(s3) & Theme(s3,x4) & n_girl(x3) & Theme(s2,x1) & a_next(s2)) & Topic(e1,p1) & Actor(e1,x1) & v_walk(e1) & in(x1,x2) & n_dress(x2) & a_white(s1) & Theme(s1,x2) & n_girl(x1))
-exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_person(x1))