A group of motorcyclist are ridding through the streets.
There are men and women.
Motorcyclist are not necessarily men and women.
exists e1 x1 x2 x3.(n_street(x3) & through(e1,x3) & Actor(e1,x1) & v_rid(e1) & of(x1,x2) & n_motorcyclist(x2) & n_group(x1))
exists p1 x1 x2 x3 x4.((x1 = x2) & n_woman(x4) & n_man(x3) & subset_of(x4,x2) & subset_of(x3,x2))