3-2-3 Card Trick (Absolute Math Magic 💎)

Apologies for the abrupt editing cuts at important points in the video---I decided to remove a few distracting verbal stutters.
This amazing (original) mathematical card effect is based on principles taught in the Hidden Structures Online Course:
/ @absolutemathmagic
As presented here, however, you can perform this surprising card effect right away---without (necessarily) understanding all of the underlying mathematics.
The Charlier Shuffle (mentioned in the current video):
• Card Magic: The Charli...