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variables, simple variables, basic math, expert physics, lists, simple conditionals, advanced animation, text handling, simple messaging, simple motion, delays, miscellaneous, simple events, advanced motion, visibility, input/output, conditional loops, cloning, advanced events, functions, simple loops, program control, screen bounds, layers, simple sound playing, direction and turning, detect conditions, advanced physics, advanced math, shape drawing, pen size, pen color, fill color, actor properties, music and instruments, simple costume handling, simple drawing, basic physics,