User blog comment:LovingKate/300NX OFF!/@comment-4252375-20130923222014/@comment-1906486-20130929220329

Actually the NX from "Credit" and "Prepaid" was actually one. Just it became abused to a point I'm guessing, so they split it as a result of said abuse. I remember looking back, and it was only one NX type. Of course that was early CA times. :P