Many cyclists race down a road in uniform.
There are people roller skating
cyclists is contradictory to skating
exists x1 x2 x3 x4.(a_topic(x1) & down(x1,x3) & in(x3,x4) & n_uniform(x4) & n_road(x3) & n_race(x1) & of(x1,x2) & n_cyclist(x2) & n_quantity(x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Actor(e1,x4) & v_skate(e1) & (x2 = x4) & Time(x2,x3) & n_roller(x3) & n_people(x2))