This person delivering this lesson talks fast clearly assumes we know more than I do, I don’t understand at all. I will have to go back to try to fill in the gaps
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Hi @Philis, hope you are great.
Which lesson are you referring? Some vides worth’s to watch them twice to understand properly the subject. Anyway if you have any doubt please ask so we can help you understand it clearly 
If you have any more questions, please let us know so we can help you! 
Carlos Z.