thank you very much for all explanations.
I would like to say , there is no mistake.
but I want to say something please.
in fact , I understood well that the first pages are requested by cpu isn't page fault . that is good and what Morris mano agree with you in that in his book (computer system architecture)
But he stated that when a cpu requests for ex. page 6 as in earlier ex. ,in this case there is a page fault ,and he didn't state if this page in swap file or not.