DE unit 1 & 2 notes

https://drive.google.com/file/d/1od92zu5gB8GCErUcE7Y837pyYRGuyMd3/view?usp=sharing https://drive.google.com/file/d/1x8i_f9avbHMx6xKKHw2Hhxo4pCNOh32f/view?usp=sharing

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