Guys are running in a marathon.
The marathon is 26.2 miles
We don't know how many miles the marathon is.
exists e1 x1 x2.(in(e1,x2) & n_marathon(x2) & Actor(e1,x1) & v_run(e1) & n_guy(x1))
exists p1 x1.(n_marathon(x1) & exists x2.((x1 = x2) & n_mile(x2) & card_eq_26.2(x2)))