Many people in the open market on the street.
Several men swap fish at a farmers market.
People other than men attend markets, they may engage in commerce that doesn't include fish, and there are open markets that are not farmers markets.
exists s1 x1 x2 x3.(n_street(x3) & n_market(x2) & a_open(s1) & Theme(s1,x2) & a_topic(x1) & on(x1,x3) & in(x1,x2) & n_people(x1) & n_quantity(x1))
exists e1 s1 x1 x2 x3 x4.(at(e1,x4) & n_farmer(x4) & Time(e1,x3) & n_fish(x3) & Theme(e1,x2) & Actor(e1,x1) & v_swap(e1) & n_market(x2) & n_man(x1) & a_several(s1) & Theme(s1,x1))