IPR notes

https://drive.google.com/file/d/1MN8ZfZTXxtu8xyU6gHkDyxECRwGP5qra/view?usp=sharing https://drive.google.com/file/d/16iw2_kHol6XmA6KRpqQTs2bTDOBSc-tv/view?usp=sharing

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