Cyclists are racing; the leader is wearing red, has a red bike, and sports red sunglasses.
The cyclists are all on black bikes.
They cannot all be on black bikes if the leader has a red bike.
exists e3 e2 e1 p1 s1 s2 x1 x2 x3 x4 x5 x6.(n_leader(x2) & Theme(e3,x3) & Actor(e3,x2) & v_have(e3) & subset_of(x5,x3) & n_sunglass(x5) & a_red(s2) & Theme(s2,x5) & of(x5,x6) & n_sport(x6) & subset_of(x4,x3) & n_bike(x4) & a_red(s1) & Theme(s1,x4) & exists s3.(Theme(s3,x2) & a_red(s3)) & Topic(e2,p1) & Actor(e2,x2) & v_wear(e2) & Actor(e1,x1) & v_race(e1) & n_cyclist(x1))
exists p1 x1.(n_cyclist(x1) & exists s1 x2.(r_all(x1) & on(x1,x2) & n_bike(x2) & a_black(s1) & Theme(s1,x2)))