An agency will select three comrades from Zhao Yi, Qian Er, Sun San, Li Si, Zhou Wu, and Wu Liu to form a team to go abroad on official business  For various reasons, in terms of personnel composition, relevant leaders have worked for a long time  After inspection, the following judgments are reached: (1) If Qian Er is not selected, then Li Si will not be selected  (2) Either Zhao Yi or Sun San will not be selected  (3) Only if Qian Er is not selected, Sun San will not be selected   (4) If Wu Liu is selected, then Zhou Wu will not be selected, then Li Si will be selected
(5) Zhao Yi and Wu Liu will be selected
Sun San.