orig aoa: ARRAY(0x183f064) ARRAY(0x18350e8) ARRAY(0x1835190) ARRAY(0x1835238)
$VAR1 = [
          [
            'CR',
            '161508',
            '111847',
            '151085',
            '190251'
          ],
          [
            'CR',
            '161509',
            '111847',
            '190251',
            '190252'
          ],
          [
            'CR',
            '161510',
            '111847',
            '190252',
            '190150'
          ],
          [
            'CR',
            '161511',
            '111847',
            '190150',
            '190153'
          ]
        ];

spliced aoa: ARRAY(0x183f064) ARRAY(0x1835190) ARRAY(0x1835238)
$VAR1 = [
          [
            'CR',
            '161508',
            '111847',
            '151085',
            '190251'
          ],
          [
            'CR',
            '161510',
            '111847',
            '190252',
            '190150'
          ],
          [
            'CR',
            '161511',
            '111847',
            '190150',
            '190153'
          ]
        ];

spliced: ARRAY(0x18350e8)
$VAR1 = [
          [
            'CR',
            '161509',
            '111847',
            '190251',
            '190252'
          ]
        ];