In my Eternal Search for the Organized Mind, I put together some notional ideas of Venn Diagrams for the Kerth Categories. Some may want to just throw their hands up now, wink but others may find this intersting, and maybe even helpful.

[Linked Image]

For those not used to these things, the amount of overlap between the circles indicates the amount of common ground of A and B plot. They are not to be taken too literally, but are notional. A story 50% A and 50% B would have the circles overlap each other. For example, for Best Relationship, the second group is all B with a little A peeking out. The diagram is changed. I also added a B alone to Holiday and Special Occasions.
cool
Artemis

History is easy once you've lived it. - Duncan MacLeod
Writing history is easy once you've lived it. - Artemis