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@a = ('a',   4);  # ok
@a = ('a' => 4);  # ok
...

# Often used for hashes:
%h = ( key => 'value' );

@a = qw( a b c );
$ap = \@a;
...

$obj = MyClass->new();
$obj->method();

$a = 'test';
print('$a\n');   # prints: $a\n
...
print('@a\n');   # prints: @a\n
print("@a\n");   # prints: abc and a newline
print("\@a\n");  # prints: @a and a newline