Submitted by a member of the Optimem community. Quality and accuracy vary — use with some discretion.
Updated
A systematic cipher/encoding flashcard set mapping alphanumeric characters to quaternary patterns.
License: Public Domain (CC0)
This content is in the public domain. You may use it freely without restrictions or attribution requirements.
Download the #1 distraction-free learning app for iOS and Android
5 minutes a day · 90% retention rate · Study anywhere, anytime