Of course there may arise some threads concerning which it becomes a puzzle to decide, for placement purposes, Which type izzit? Especially when Creep approaches Crossover. (Say, does a BS thread ever evolve into mostly Music? Why not?? :) But then again: So Wot? You can't Legislate for all the Exceptions. Hard cases make bad law, dear kindly Joe Yer Honor. / Screw it, flip a coin when it happens. We can find what we want.