Based on kranebob's version, cleaned up the typesetting and added the si flat to the clef. Fixed one height and typos in the text.

Considering that the PrM version is largely modeled on the R/ Si diligis me, I admit the idea of re-doing a closer contrafactum from a the new restitution of the R/ Si diligis me. => dcrochu as of 26/08/2025 plus rsigns and some NABC placement tweaks + c2->cb4