$VAR1 = [
          [
            'Line_1_3',
            'Line_2_3'
          ],
          [
            'Line_3_3'
          ],
          [
            'Line_4_3',
            'Line_5_3',
            'Line_6_3',
            'Line_7_3'
          ]
        ];

##</code><code>##

$VAR1 = {
          'sample.txt' => [
                            'Line_1_3',
                            'Line_2_3'
                          ],
          'sample_2.txt' => [
                              'Line_3_3'
                            ],
          'sample_3.txt' => [
                              'Line_4_3',
                              'Line_5_3',
                              'Line_6_3',
                              'Line_7_3'
                            ]
        };