A little girl is running.
The boy is running.
There can be either a girl or a boy.
exists e1 s1 x1.(Actor(e1,x1) & v_run(e1) & n_girl(x1) & a_little(s1) & Theme(s1,x1))
exists e1 x1.(n_boy(x1) & Actor(e1,x1) & v_run(e1))