Because of the need for work, a certain unit decided to select four of its three women (Xiao Wang, Xiao Li Xiao Sun) and five men (Xiao Zhang, Xiao Jin, Xiao Wu Xiao Meng, Xiao Yu) to form a negotiating group to participate in an important negotiation  The selection conditions are as follows: (1) the members of the group should have both women and men  (2) Xiao Zhang and Xiao Wang can't both be selected  (3) Xiao Li and Xiao Sun can't both be selected
(4) if Xiao Yu is chosen, Xiao Wu will not be chosen
If you choose Xiao Wu, choose Xiao Yu