One motorcyclist covered in mud riding his motorcycle through the mud.
A human on a bike.
a motorcyclist is a human. bike is another way to say motorcycle.
exists e2 e1 x1 x2 x3 x4.(in(e1,x2) & through(e2,x2) & n_mud(x2) & n_mud(x2) & Theme(e2,x4) & Actor(e2,x3) & v_ride(e2) & n_motorcycle(x4) & of(x4,x2) & n_male(x2) & (x2 = x3) & Theme(e1,x1) & v_cover(e1) & n_motorcyclist(x1) & card_eq_1(x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_bike(x2) & n_human(x1))