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  1. or download this
    sub BackAndForth {     
     my ($filename) = @_;
...

      my %ExternalHash = &BackAndForth('filename.csv');
         %ExternalHash = &BackAndForth('filename2.csv');
  2. or download this
              %ALLDATA = (
               'key1' => HASH(0x9021f6c)
...
                                  0  value1
                                  1  value2
  3. or download this
       %thisDataset = (
          '' => HASH(0x876f324)
                'key2' => HASH(0x9029220)
                       empty hash)
  4. or download this
           return(\%ALLDATA)
       %external = (yadda yadda)
             or 
       $external = (blah ...