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Investigate and expand the id range to yymm.nnnnn - We have already had months with > 8000 submissions (1210=> 8452, 1304 => 8135), and must soon expect to have > 9999 submissions in a month. This requires migration to yymm.nnnnn ids instead of the current yymm.nnnnnnnnn. From January 2015 submissions will get yymm.nnnnn identifiers, existing submissions will retain yymm.nnnn identifiers.
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