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This method is good for animating motions you already know its trajectory, like thrown items, opening hatchets, car moving along a road…. However when it comes to moving limbs, it's very hard to anticipate the trajectory. To modify the speed, acceleration or angle along the curve you need to edit the easing and start angle for the whole tween, and one mistake can ruin the whole motion. Also you need to place the transformation point exactly on the curve or flash will just ignore it. This method is simple but gives limited customizability and limited room for mistakes.