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Permutations: Difference between revisions
→{{header|Perl 6}}: explain use of "after"
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=={{header|Perl 6}}==
This is generic code that works with any ordered type. To force lexicographic ordering, change <tt>after</tt> to <tt>gt</tt>. To force numeric order, replace it with <tt>></tt>.
<lang perl6>sub next_perm ( @a is copy ) {
my $j = @a.end - 1;
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