Compare Query

I have a table that shows Part Numbers. Each part number can be listed multiple times depending on how man Build ID's it is associated to.
Example:
Part Nubmer 123456 could be associated with:
Build Id's F187, A910, F001, C810, E010, C809
or it might only be associated to 1, 2, 3, 4,or 5 of those Build Id's.
What I want my query to do is find any Part Number that is only associated with anything less than all six of the Build Id's.
Example:
Part Number 123456 is only associated with:
Build Id's F187 & A910 or only F001 & C809 or only E010.
If this was the case I would like for that Part Number to show up in the Query along with whatever Build Id's it is associated with as long as it is not associated with all six Build Id's. The Build Id Field is also part of the table.

Any help on how to do this.

Hope all of this makes sense.

Thanks!