Post making contest 3.0

This is update #78.

Here is an incomplete list of things that your correspondent here knows off by heart:

• An impractical number of digits of pi.
  
• The names and symbols of all the elements on the periodic table (convenient for last round).
  
• The xyz coordinates of all 74 portal-accessible locations in the Submachine series of point-and-click puzzle games and the 26 three-character designations of the karma portal drop zones. (it was easier than constantly having to check my notes, apparently)
  
• The lyrics to far too many albums in their entirety, frequently without me having realised I'd internalised them, including ones I haven't heard in years (turns out that CD of Beck albums my dad made for long car journeys when I was about ten still haunts me to this day, because I immediately knew how to solve this puzzle from recognising one line).
  
• The names of every ship in the Culture series.
  
• The lyrics to songs that don't even have lyrics (I do a mean Frontier Psychiatrist).
  
• The first half of the second pair of Schubert's Two Waltzes that I learnt for that one piano grade exam years ago but refuses to leave my muscle memory for no good reason, despite the latter half having gone long ago.
  
• More of Old Possum's Book of Practical Cats than I should.
  
• More trigonometric identities than are really necessary (gee, thanks Mr. Wiltshire).
  

And, the most recent addition:

• A proof that Charpit's method works.
  

End of message.

this passes rule 3 and 5

five is a number
and so are we

this passes rule 4 and 5