Two people performing an archaeological dig.
No one is digging.
Two people aren't no one.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_dig(x3) & a_archaeological(s1) & Theme(s1,x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
-exists e1 x1.(Actor(e1,x1) & v_dig(e1) & n_one(x1))