A man in a black jacket is admiring the merchandise from a street vendor who is wearing a brown jacket.
A man is looking to purchase a knock off purse from a street vendor.
Admiring merchandise does not mean he is looking to purchase.  Not all merchandise is a knock off purse.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_merchandise(x3) & from(e1,x4) & Theme(e2,x7) & Actor(e2,x6) & v_wear(e2) & n_jacket(x7) & a_brown(s2) & Theme(s2,x7) & (x4 = x6) & n_vendor(x4) & of(x4,x5) & n_street(x5) & Theme(e1,x3) & Actor(e1,x1) & v_admire(e1) & in(x1,x2) & n_jacket(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_look(e1) & exists e2 x2 x3 x4 x5.(Theme(e2,x2) & Actor(e2,x1) & v_purchase(e2) & off(x2,x3) & from(x3,x4) & n_vendor(x4) & of(x4,x5) & n_street(x5) & n_purse(x3) & n_knock(x2)) & n_man(x1))