The bike rider runs with his red bike while another gains on him, both wearing green outfits and black helmets.
Two bikers are expending a lot of physical energy.
if there is a bike rider and another gaining on him, then there are two. biker is another word for bike rider.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8.(n_helmet(x8) & a_black(s3) & Theme(s3,x8) & n_outfit(x7) & subset_of(x8,x6) & subset_of(x7,x6) & a_green(s2) & Theme(s2,x6) & Actor(e2,x6) & v_wear(e2) & n_male(x1) & n_male(x1) & n_gain(x3) & n_bike(x2) & n_bike(x2) & a_red(s1) & Theme(s1,x2) & of(x2,x1) & n_rider(x1) & of(x1,x2) & while(e1,x4) & on(x4,x5) & subset_of(x6,x5) & subset_of(x1,x5) & n_gain(x4) & -(x4 = x3) & with(e1,x2) & Actor(e1,x1) & v_run(e1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_expend(e1) & of(x2,x3) & n_energy(x3) & a_physical(s1) & Theme(s1,x3) & n_lot(x2) & n_biker(x1) & card_eq_2(x1))