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in reply to How do I use/reference Multidimensional hashed arrays?

Here is how you create and use a multidimensional hash that contains arrays. 
my $data_source = {};

for( my $i = 0; $i < 10; $i++) {
   $data_source->{a}[$i] = "source a's data";
   $data_source->{b}[$i] = "source b's data";
   $data_source->{c}[$i] = "source c's data";
}

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In Section Seekers of Perl Wisdom