Man in a helmet riding a dirt bike covered with mud.
A man finishes first in his dirt bike race.
A man riding a dirt bike does not imply that he is in a race or that he finishes first.
exists e2 e1 x1 x2 x3 x4 x5 x6.(with(e2,x6) & n_mud(x6) & Theme(e2,x1) & v_cover(e2) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & of(x4,x5) & n_dirt(x5) & (x2 = x3) & n_helmet(x2) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(in(e1,x2) & n_race(x2) & of(x2,x4) & n_bike(x4) & of(x2,x3) & n_dirt(x3) & of(x2,x1) & n_male(x1) & a_first(s1) & Manner(e1,s1) & Actor(e1,x1) & v_finish(e1) & n_man(x1))