'Bareword file handle opened at line 37, column 2.  See pages 202,204 of PBP.  (Severity: 5)',
'Two-argument "open" used at line 37, column 2.  See page 207 of PBP.  (Severity: 5)',
'Close filehandles as soon as possible after opening them at line 37, column 2.  See page 209 of PBP.  (Severity: 4)',
'"$nm" is declared but not used at line 27, column 1.  Unused variables clutter code and make it harder to read.  (Severity: 3)',
'Mismatched operator at line 53, column 21.  Numeric/string operators and operands should match.  (Severity: 3)',