A girl, wearing a black vest and leggings with purple shorts, is riding a red bike down the street.
A girl is wearing a bicycle helmet.
The girl on the bicycle might not be wearing a bicycle helmet at all, and nothing indicates that she definitely is.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8.(n_street(x8) & down(e2,x8) & Theme(e2,x7) & Actor(e2,x1) & v_ride(e2) & n_bike(x7) & a_red(s3) & Theme(s3,x7) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & subset_of(x5,x3) & with(x5,x6) & n_shorts(x6) & a_purple(s2) & Theme(s2,x6) & n_leggings(x5) & subset_of(x4,x3) & n_vest(x4) & a_black(s1) & Theme(s1,x4) & (x1 = x2) & n_girl(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2) & of(x2,x3) & n_bicycle(x3) & n_girl(x1))