my $txt = 'hello world';
print "$txt\n";           # prints "hello world"
my $txt = 'oh noes';
print "$txt\n";           # prints "oh noes"

##</code><code>##

my $txt = 'hello world';
print "$txt\n";
$txt = 'oh noes';         # note, no "my"
print "$txt\n";