Motorcyclists with white helmets in a parking lot.
There is a motorcyclist with a white helmet because that's the only helmet they own.
Wearing a white helmet does not imply it is the only helmet the biker owns.
exists s1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & in(x2,x3) & n_lot(x3) & of(x3,x4) & n_parking(x4) & n_helmet(x2) & a_white(s1) & Theme(s1,x2) & n_motorcyclist(x1))
exists p1 p2 x1 x4 x5.(n_thing(x5) & all x7.(n_helmet(x7) -> (x5 = x7)) & n_helmet(x5) & n_thing(x4) & exists p3 e1 x6.((x4 = x5) & Theme(e1,x6) & Actor(e1,x5) & v_own(e1) & (x5 = x6)) & because(p1,p2) & exists s1 x2 x3.((x1 = x2) & with(x2,x3) & n_helmet(x3) & a_white(s1) & Theme(s1,x3) & n_motorcyclist(x2)))