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  1. or download this
    my @mixedcasekeys = ('ABC', 'foo', 'ExAbbrev');
sub value { return "This is the value for $_\n"; }
...
    (join ' ', map {$hash{$_}[0]} keys %hash) . "\n";
}
  2. or download this
    $;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/