My fault. Your posts looked like SPAM.
Copied half the thread in a quote and added 1 sentance with a link. (4 times)
My bad.
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it is seemd that my english is so poor.
the bam's question is that when the period is so long, from one to 2^n change so much.such as from 1 to 2, 3->4, 7->8, 15->16, 31->32,63->64, 127->128.
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