[f1shy]

As part of this course [0] In one lesson [1] such system seems to be discussed.

Also look at the list at 0:29 in https://m.youtube.com/watch?v=UseJfcmG3po&list=PLwJ2VKmefmxp...

[0] https://m.youtube.com/playlist?list=PLwJ2VKmefmxpUJEGB1ff6yU...

[1] https://m.youtube.com/watch?v=z9cKZEz_Z00&list=PLwJ2VKmefmxp...