Exprésate 2
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Ch.2
Ch.3
Ch.4
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Ch.6
Ch.7
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Lesson 1: Formal Commands, Part 1
http://www.youtube.com/watch?v=Lt3f-ev4j0A
Lesson 2: Formal Commands, Part 2
http://www.youtube.com/watch?v=NqpIMpeCECQ