The horse on the right has a red mane.
There are exactly two horses
There are not necessarily exactly two horses. There could be more, or fewer, than two horses.
exists e1 s1 x1 x2 x3.(n_right(x2) & n_horse(x1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_mane(x3) & a_red(s1) & Theme(s1,x3) & on(x1,x2))
exists p1 s1 x1.(a_exactly(s1) & Manner(p1,s1) & exists x2.((x1 = x2) & n_horse(x2) & card_eq_2(x2)))