The bike rider runs with his red bike while another gains on him, both wearing green outfits and black helmets.
Two bike riders are know each other, personally, outside of biking.
One bike rider gaining on another does not imply that the riders know each other personally.
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 x1 x2 x3.(all x4.(n_other(x4) -> exists e2 x5 x6.(Theme(e2,x4) & Actor(e2,x1) & v_know(e2) & of(x5,x6) & n_biking(x6) & outside(x4,x5) & n_thing(x5) & r_personally(x4))) & Actor(e1,x3) & v_be(e1) & (x1 = x3) & n_rider(x1) & of(x1,x2) & n_bike(x2) & card_eq_2(x1))