Potential customers shopping in a busy marketplace.
Nobody is shopping.
Either potential customers are shopping or nobody is shopping
exists e1 s1 s2 x1 x2.(in(e1,x2) & n_marketplace(x2) & a_busy(s2) & Theme(s2,x2) & Actor(e1,x1) & v_shopping(e1) & n_customer(x1) & a_potential(s1) & Theme(s1,x1))
-exists p1 x1.(exists x2.((x1 = x2) & n_shopping(x2)) & n_person(x1))