@WchPl : PP1 - Either a bar ID PP1, or it does NOT. "NOT" being NOT PP1, ie. absence of PP1 (accel), etc. on a third P1. There is no "NOT NOT PP1" or "NOT NOT EE" that I've seen. On 4th P1 you know you have four consecutive P1's, and when NOT PP1, another EE might ID instead.
I'm probably...