Against a backdrop of scenic snowcapped mountains, a bike rider appears.
The biker rides in front of some mountains.
a bike rider is rephrased as a biker.
exists e1 s1 s2 x1 x2 x3 x4.(against(e1,x3) & of(x3,x4) & n_mountain(x4) & a_snowcapped(s2) & Theme(s2,x4) & a_scenic(s1) & Theme(s1,x4) & n_backdrop(x3) & Actor(e1,x1) & v_appear(e1) & n_rider(x1) & of(x1,x2) & n_bike(x2))
exists e1 x1 x2 x3.(n_biker(x1) & in(e1,x2) & of(x2,x3) & n_mountain(x3) & n_front(x2) & Actor(e1,x1) & v_ride(e1))