(0, 0) is not used and can not be modified - it is the best that can be replaced.
(0, 1) is not used (recently), but were modified - it s not good because the pages. This must be done prior to being replaced.
(1, 0), it is used but not solved - the possibility that it will be available again soon.
(1, 1) is being used and updated - is gone. that will be used again and must be written before being replaced.
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