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```
substr( $string, -5, 5 ) = '';
```

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use strict;
use warnings;
...
GCGTCGCCAGCACAGAGGCCATGCGATCCGTCGAGTTATCATGAATCATCAGAGCAACGGGCAGAGCCCG
+CGTCGACCTTTTATCTAATAAATGCGTCCCT
+
@CCDFFFFGHHHHJIIIJJIJJJJIIJJJJFHIBFBFHIGJJIGI@GHGGEHHHHHHFFDDABDDDDDDD
+DDDDBDBBBDCCCCCDDDDCDDEECB8<@DD