CAS Registry Numbers



Can someone explain the structure of a CAS registry number and how it is
 generated?  According to the CAS web site, 336607-92-2 is the most recent
 CAS Registry Number as of this morning.  I know there is no chemical meaning
 or significance to the numbers, but what is each of the three fields and how
 are the numbers assigned?
 Doug
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 > Row2 Technologies Inc.
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