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  1. or download this
    my $bar = 3;
my $foo = 'Bar is $bar';
print $foo, "\n";
  2. or download this
    my $bar = 3;
my $foo = "Bar is $bar";
print $foo, "\n";
  3. or download this
    For literal strings, quote with Single.
(Isn't this a silly jingle?)
Interpolation uses Double.
Forget this rule, you'll be in trouble.