Ken 8446b010c9 adding step 2.4 and 2.5 exercises		2019-03-02 22:56:59 -08:00
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demo	step 2.6 demo refinement	2019-03-02 22:24:18 -08:00
exercise	adding step 2.4 and 2.5 exercises	2019-03-02 22:56:59 -08:00