The Fisher-Yates shuffle is easy to code up:
# randomly permutate @array in place
sub fisher_yates_shuffle
{
my $array = shift;
my $i = @$array;
while ( --$i )
{
my $j = int rand( $i+1 );
@$array[$i,$j] = @$array[$j,$i];
}
}
fisher_yates_shuffle( \@array ); # permutes @array in place
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