So...
You have found your way to the Crypto-Complex.
We understand that some of you have been under "Lockdown" in The Village for what seems an eternity; that you have lost track of time; and you are beginning to feel your skills (whatever they are which have deemed your attendance at this venue) are beginning to fade into obscurity.
As a result we offer a refresher course on simple communication methods you may be familiar with (or not) as the case may be.