People are standing in a market area.
People are shopping for vegetables at the farmer's market.
There are other types of markets besides farmer's markets. People can buy many other things besides vegetables at a market.
exists e1 x1 x2 x3.(in(e1,x2) & n_area(x2) & of(x2,x3) & n_market(x3) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists e1 x1 x2 x3 x4.(n_market(x4) & of(x4,x3) & n_farmer(x3) & at(e1,x4) & for(e1,x2) & n_vegetable(x2) & Actor(e1,x1) & v_shop(e1) & n_people(x1))