At the hand over when arriving at a place, anywhere on Earth, is was costume to ask the opposite if any “Thumb of Rules” could be sought, at present point in time, when one self never had been at this particular place on Earth in own lifetime
Plural in form but plural and singular in construction
The thumb of rule did contain, when genuine, a form to continue the construction and I do believe most people that have been standing on the shoulder of Giants do know this at least they should have known and if not they have not adhered to own learning that is Due Diligence and Notice to Correction
Here we have Katherine Watt giving away, for free, a world Thumb of Rules at present point in time (The 2020 Hoax throwing humanity into Non Charted Waters ) the form and the construction