A group of runners smile at one another.
The runners are old
A group of runners smile at one another does not imply they are old
exists e1 s1 x1 x2 x3.(at(e1,x3) & n_thing(x3) & card_eq_1(x3) & a_another(s1) & Theme(s1,x3) & Actor(e1,x1) & v_smile(e1) & of(x1,x2) & n_runner(x2) & n_group(x1))
exists s1 x1.(n_runner(x1) & Theme(s1,x1) & a_old(s1))