People with numbers on their chests are running in a pack.
Marathon runners end up grouped together after a collision between runners.
Numbers on their chests are running does not mean they are marathon runners.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_pack(x4) & Actor(e1,x1) & v_run(e1) & on(x1,x3) & n_chest(x3) & of(x3,x1) & n_thing(x1) & with(x1,x2) & n_number(x2) & n_people(x1))
exists e2 e1 p1 s1 x1 x2 x3 x4.(for(e1,e2) & after(e2,x3) & between(x3,x4) & n_runner(x4) & n_collision(x3) & exists s2.(Theme(s2,x1) & a_together(s2)) & Recipient(e2,p1) & Topic(e2,x1) & v_group(e2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_end(e1) & n_runner(x1) & (x1 = x2) & ne_nam_marathon(x2))