5.6.1 is the short way of saying 5.006001 (or 5.006001 is the long way of saying 5.6.1 depending on how you look at it) 
$ perl -MConfig -le'print for $], $Config{version}'
5.008008
5.8.8

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In reply to Re^2: Version(s) of Perl by ikegami
in thread Version(s) of Perl by rpike

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