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Global symbol "%mapping" requires explicit package name at ./t line 26
+.
Global symbol "%mapping" requires explicit package name at ./t line 27
+.
...
Global symbol "%mapping" requires explicit package name at ./t line 31
+.
Global symbol "%mapping" requires explicit package name at ./t line 39
+.
Execution of ./t aborted due to compilation errors.

Use of uninitialized value in concatenation (.) or string at ./t.pl li
+ne 40, <IHF> line 233.

 print "$mapping{$n}\n";