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    [0]  [1]
[0] chr1 10 
...
.
.
[n] chr5 5

    [0]  [1]
[0] chr1 10 
...
.
.
[n] chr5 5

my @sortedtda;
my @chrnums;
...
            $chrnums[$a] <=> $chrnums[$b]
               } 0..$#twodarray
           ];