I'll speak first to “single payer”. It's a term that is used very commonly. It was used as far back as the 2019 panel report by Dr. Hoskins and that advisory panel. It's quite a well-understood term. For that reason, there was, in our view, no need to define it.
Similarly, “first dollar”, as I mentioned, does have a definition that's quite well understood. It's not unusual in legislation that if there is a technical term that's understood within a context, you don't define it, because it has a meaning already.