Understanding the Mechanics of a Walkcycle

The first task is to draw a basic walk cycle  to understand the mechanics of it.
Simply enough, half of the period of the walk cycle ( the interval between one foot being raised up from the ground till it's again touching the ground) is constructed of main 5 poses:

By repeating those poses and  adding characteristics,  weight we get different walk types. The difference  should be evident in every  walk cycle. 

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