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#!/usr/bin/perl
use warnings;
...
}
close (INFILE);
close (DATA);

Reading mapping file
----------------------------
...
Use of uninitialized value in concatenation (.) or string at seek.pl l
+ine 29, <DATA> line 19969.
Use of uninitialized value in concatenation (.) or string at seek.pl l
+ine 29, <DATA> line 19969.
Unmatched [ in regex; marked by <-- HERE in m/\b([ <-- HERE ]{,})\b/ a
+t seek.pl line 29, <DATA> line 19969.