Two men are riding a couple of horses, chasing a white animal.
The men are cowboys, wrangling up a stray and lost calf.
Not all men are cowboys.  Not all white animals are a stray and lost calf.
exists e2 e1 s1 x1 x2 x3 x4 x5.(Theme(e2,x2) & Actor(e2,x1) & v_ride(e2) & Theme(e1,x5) & Actor(e1,x4) & v_chase(e1) & n_animal(x5) & a_white(s1) & Theme(s1,x5) & (x2 = x4) & of(x2,x3) & n_horse(x3) & n_couple(x2) & n_man(x1) & card_eq_2(x1))
exists e2 e1 p1 s1 x1 x2 x3.(n_man(x1) & Theme(e2,x3) & Actor(e2,x1) & v_lose(e2) & n_calf(x3) & for(p1,e1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_wrangle(e1) & n_stray(x2) & exists x4.((x1 = x4) & n_cowboy(x4)))