This is the hierarchy of the subtype systems. I've seen it posted in another thread and I've already reposted it several times here and there because it's quite useful. It can be applied to every type in this form: (order: Base type - 2 subs - 4 subs DCNH - 8 subs IE - 16 subs dual type) I don't claim that 8+ subtypes are reasonable, this is just how they are organized.
.................................................. ENFp -ENTj
...................................Te-ENFp
.................................................. ENFp -ESTj
................... D-ENFp
.................................................. ENFp -ENFj
...................................Fe-ENFp
.................................................. ENFp-ESFj
........ Fi-ENFp
.................................................. ENFp-INTj
...................................Ti-ENFp
.................................................. ENFp-ISTj
................... N-ENFp
.................................................. ENFp-INFj
...................................Fi-ENFp
.................................................. ENFp-ISFj
ENFp -
.................................................. ENFp-ENTp
...................................Ne-ENFp
.................................................. ENFp-ENFp
................... C-ENFp
.................................................. ENFp-ESTp
...................................Se-ENFp
.................................................. ENFp-ESFp
........ Ne-ENFp
.................................................. ENFp-INTp
...................................Ni-ENFp
.................................................. ENFp-INFp
................... H-ENFp
.................................................. ENFp-ISTp
...................................Si-ENFp
.................................................. ENFp-ISFp
As you can see, there is a rational/irrational divide within the accepting/producing subtype system. Basically, you have to choose one possibility in each step from left to right. For example: ENFp -> Ne-ENFp -> H-ENFp -> Ni-ENFp -> ENFp-INTp ect.