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my @arr = ('foo','bar','qux','foo1','bar1','qux1');

...
          '1-3' => '0.300'
        };

    'x-y' => 'VALUE'

...
     '0-3' => '0.300', means that
     'foo' and 'foo1' has value 0.300 OR
     'foo1' and 'foo' has value 0.300

foreach my $z (0 .. ($#arr-1)) {
...

}