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Global symbol "$index" requires explicit package name at /home/../scri
+pts/creaNexusMatrix.pl line 12.
Execution of /home/../scripts/creaNexusMatrix.pl aborted due to compil
+ation errors.

my $index;

my @column;
my $index;
...
    print join "\t", map { $_->[ $row ] } @column;
    print "\n";
};

--

...

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