Two people in red outfits riding their bicycles down a dirt road.
The people are on mountain bikes.
Not all bicycles are mountain bikes.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & down(e1,x5) & n_road(x5) & of(x5,x6) & n_dirt(x6) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bicycle(x4) & of(x4,x1) & n_thing(x1) & (x1 = x3) & in(x1,x2) & n_outfit(x2) & a_red(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))
exists p1 x1.(n_people(x1) & exists x2 x3.(on(x1,x2) & n_bike(x2) & of(x2,x3) & n_mountain(x3)))