A sales representative plans to visit each of six stores U, V, W, X, Y and Z exactly once during the course of one day. He is setting up his schedule for the day in accordance with the following conditions:

(i). He must visit U before V and Z.
(ii). He must visit V before Y.
(iii). The third store he visits must be X.

The sales representative could visit any of the following companies immediately after X, except: