This tutorial is great. The only problem is, that I get the following result, if I comment out all the cases:

!rekcaH~lreP~rehtonA~tsuJ
JUST~ANOTHER~PERL~HACKER!
!rekcaH~lreP~rehtonA~tsuJ
JUST~ANOTHER~PERL~HACKER!
!rekcaH~lreP~rehtonA~tsuJ
JUST~ANOTHER~PERL~HACKER!
!rekcaH~lreP~rehtonA~tsuJ
JUST~ANOTHER~PERL~HACKER!

Shouldn't there be some error messages or warnings?

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