Men dressed in yellow jackets riding motorcycles.
The men are wearing black pants.
One cannot assume that the men in yellow jackets are also wearing black pants.
exists e1 e2 s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_ride(e2) & n_motorcycle(x5) & (x3 = x4) & n_jacket(x3) & a_yellow(s1) & Theme(s1,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_pants(x2) & a_black(s1) & Theme(s1,x2))