A man is sitting at a laptop , while two men ( one sitting , one standing up ) face each other in the background .
We believe that two man face each other while a third stares at the screen of his computer .
We believe that two man face each other while a third stares at the screen of his computer .
It is probably not the case that two man face each other while a third stares at the screen of his computer .
Two man face each other while a third stares at the screen of his computer .