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my $var; # Declares a single variable.

my $var = "Hello world!\n";
my $var = 10;
...
my $var = \%some_hash;
my $var = \$some_scalar;
my $var = \&some_function;

my ( $this, $that );

my ( $this, $that ) = ( "the", "other" );

my ($var);

my ($var) = "This";

my ( $this, $that ) = "The other";

my @array = ("This", "That", "and", "The", "Other");
my %hash = ( "This" => "That",
...
                  # constructer is distributive and
                  # applies to both items inside the rvalue
                  # list.