Actually some of the earlier sets have coins from P, D and S so 4 sets in those years.
I thought about this a little since my post and I believe the issue has already been resolved. As per Xavier, Only official sets are in scope:
"We define sets as official packaging from the mint containing one or several numismatic items. It contains only new items (not repackaging of older coins). Sets include proof sets, mint sets, coincards, rolls, etc."
Bold emphasis is his, not mine.
You selling part of a set would hardly count as “official packing from the mint.”