Google throws out indexed information?

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Hi Group

can anybode help me:

in September Googlebot ate 48,000 pages from site. In 5 days the pages
have been placed in Google's index and became searchable. But behavior
of Google is too strange. Each day it begun to throw out indexed page -
after a month there left only 18,000 pages. Why it happens? How to keep
indexed information in bot's stomach. And finally - i think this is
unfair - i have sacrificed with server load, traffic etc.,

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