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Unquoted string "dev" may clash with future reserved word at ./nelson.
+pl line 15.
Unquoted string "null" may clash with future reserved word at ./nelson
+.pl line 15.
...
Argument "dev" isn't numeric in division (/) at ./nelson.pl line 15, <
+ARGUMENTS> line 1.
Argument "" isn't numeric in division (/) at ./nelson.pl line 15, <ARG
+UMENTS> line 1.
Illegal division by zero at ./nelson.pl line 15, <ARGUMENTS> line 1.

Use of uninitialized value in scalar assignment at ./nelson.pl line 8,
+ <ARGUMENTS> line 1.
Use of uninitialized value in scalar assignment at ./nelson.pl line 9,
+ <ARGUMENTS> line 1.