60a1537d4d frodel
https://colab.research.google.....com/drive/1ho-HQe3gF
https://colab.research.google.....com/drive/1WIuXzvW3a
https://colab.research.google.....com/drive/1lsCTxv4U4
https://colab.research.google.....com/drive/1J4iFa9SyT
https://colab.research.google.....com/drive/1S8kShWQEC
http://electriman.net/?p=87