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ryy705 0 Junior Poster

Hi,
This is a simplified problem for a mock book store I am trying to build. I have been stuck on this all morning. Any help would be appreciated. Thanks.

SET 1
| 1 | a |
| 2 | b |
| 3 | c |
| 1 | d |


SET 2
| a |
| d |

Given these two reletionships how can I determine which number in SET 1 has relationship with everything that is in SET 2?

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