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> perl -w
use strict;
...
}
Global symbol "$n" requires explicit package name at - line 6.
BEGIN not safe after errors--compilation aborted at - line 7.

> perl -w
use strict;
...
}
Bareword "calldepth" not allowed while "strict subs" in use at - line 
+4.
BEGIN not safe after errors--compilation aborted at - line 12.