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Argument "O" isn't numeric in substr at test.pl line 2.
hello

Global symbol "$string" requires explicit package name at test.pl line
+ 1.
Global symbol "$string" requires explicit package name at test.pl line
+ 2.
Bareword "O" not allowed while "strict subs" in use at test.pl line 2.
Execution of test.pl aborted due to compilation errors.