If 0 is included in digits, one can use variations.

$ perl -MAlgorithm::Combinatorics=:all -le 'print @$_ for variations [reverse 0..9], 9;'

In reply to Re^2: Perl program to generate a descending order of 9-unique digit numbers by Anonymous Monk
in thread Perl program to generate a descending order of 9-unique digit numbers by amar712

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