         Expression                               Value    
1. ['A','B','C','D'] + ['E','F']                  ['A','B','C','D','E','F']
2. ['A','B','C','D'] + ['B','C','E','F']          ['A','B','C','D','E','F']
3. [1,3,7] + []                                   [1,3,7]
4. ['A','D','F'] * ['O','F']                      ['F']
5. [1,2,3,4] * [5,6,7]                            []
6. [1,2,3,4] - [5,6,7]                            [1,2,3,4]
7. [5,6,7] - []                                   [5,6,7]
8. [Able, Baker, Charlie] - [Able, Charlie]       [Baker]
