Two kids wearing blue are ridding horses.
The children are riding horses.
Two kids and children are equivalent as part of their activity riding horses.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_rid(e2) & n_horse(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_blue(x3) & (x1 = x2) & n_kid(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2))