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```
${$hash_ref}{key} = ${$array_ref}[1];
```
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```
    @$hash_ref{$key1, $key2, $key3};
```
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```
    $$hash_ref{$key1};
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    @hash_ref->{$key1, $key2, $key3};
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    $hash_ref->{$key1, $key2, $key3};
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```
    &{do {... sub {...}}};
```