On the Subtypes page of the Wikisocion website, there is a mention of Filatova's subtype theory which states there are four common subtypes for a given type:

one that has an enhanced leading function
one that had an enhanced creative function
one that has an enhanced left vertical pathway of his mental functions
one that has an enhanced right vertical pathway of his mental functions

Could someone please explain how these last two work? What would these be for an LII? How could you determine what these would be for a given socionics type?