Ep2 section "Not All Functions Have Input" should be removed

[qingfengxia]

When I was preparing instructor training checkout this month.

I found ep2 Analyzing Patient Data should be shortened. There are lots of fundamental concepts, must be explained like module,
function keyword parameter

There is a section "Not All Functions Have Input", that is not absolutely necessary, may be removed from this episode, in order to regain some time to enhance learning's understanding of module functions.

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