A man on a black mountain bike rides through a course filled with other bikers.
The man knows how to ride a bike.
If a man has the capability to ride through a course filled with other bikers we can assume he knows how to ride a bike
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7.(n_biker(x7) & through(e1,x4) & with(e2,x6) & -(x6 = x7) & n_biker(x6) & Theme(e2,x5) & v_fill(e2) & (x4 = x5) & n_course(x4) & Actor(e1,x1) & v_ride(e1) & on(x1,x2) & n_bike(x2) & of(x2,x3) & n_mountain(x3) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Topic(e1,x2) & Actor(e1,x1) & v_know(e1) & n_manner(x2) & exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_ride(e2) & n_bike(x4)))