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expert physics, resize actor, advanced motion, basic math, simple events, delays, advanced events, visibility, direction and turning, simple loops, graphic effects, simple motion, detect conditions, simple variables, simple conditionals, variables, layers, conditional loops, pen size, cloning, simple drawing, shape drawing, pen color, text handling, input/output, advanced costume handling, conditional wait, simple costume handling, advanced physics, screen bounds, advanced math, advanced messaging, basic physics, simple sound playing,