As I claimed, I'm not fully sold on this Investigation, mainly because I think plenty of people either use "free of" and "free from" interchangeably—other than in the situation of "free of demand"—or arbitrarily favor 1 or the opposite form to express precisely the same concept, without the need of https://docs.google.com/document/d/e/2PACX-1vR1aRmbt0UmT4gxVq4IXbfDVfh2KrMfGfIz30gs2kLcIKk8h4EVktV5g2U8cNCzOTBSOZHhUqlkGaRY/pub