Sorry, just found an awesome post. Here's the link for anyone that might be wondering the same thing.
http://7sage.com/discussion/#/discussion/2770/list-of-affordable-pts-paperback-hard-copy
@anne2hoang said:
Powerscore did not include "the only" on their list of sufficient condition indicators. But they did include "only" and "only if" as necessary condition indicators.
@anne2hoang,
I didn't notice Powerscore failed to distinguish …