Your selection_sample routine is not correctly coded. The idea is
to randomly select a sample of n elements as you go, there should
not be duplicates in the sample. Change your while loop to the
following for a more faithful representation of Knuth's algorithm.
while ( @results < $num ) {
if ( (@$array - $pos) * rand() < $num - @results ) {
push @results, $array->[$pos];
}
$pos++;
}
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