Need help on Cell flip up and down

Hello All,

Please help me to understand or knime flow to flip the cell values up an down for each cell for example as per the below, i want to flip the Validation -2 column cells up and down, first cell with second , 3rd with fourth simultaneously to all cells , Need your support and help.

| String                      | String         |
| Validation - 1              | Validation - 2 |
| /650                        | blank          |
|                             | blank          |
| /324                  blank | - Cell 3       |
|                             | 100000         |
| /324                        | blank          |
| /630                        | blank - Cell 6 |
|                             | 50000          |
| /324                        | blank          |
|                             | 60000          |
| /3AM                        | blank          |
|                             | 50%            |