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Next excercise is the wave principle
you'd think drawing a simple wave would be easy and it is
but applying it in action to say like a flag is incredibly difficult
for a standard wave you just gotta imagine it like a wavy wire bing pushed to one side when inbetweening
but for a flag one side's attached to a pole and the other side flails around wildly so you gotta eyeball it or use a special trick to make it work