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1.3 Pre-Class Lecture duration 8 minutes 13 seconds 1.3 Pre-Class Lecture 1.3 Pre-Class Lecture	1.3 Pre-Class Lecture protons +19 More From Leena Nabulsi 0 likes 35 plays 0
1.2 Pre-Class Lecture duration 11 minutes 42 seconds 1.2 Pre-Class Lecture 1.2 Pre-Class Lecture	1.2 Pre-Class Lecture things +19 More From Leena Nabulsi 0 likes 36 plays 0

1.3 Pre-Class Lecture