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visibility, basic math, simple variables, simple conditionals, delays, simple events, simple loops, simple messaging, input/output, resize actor, functions, advanced motion, simple motion, cloning, screen bounds, direction and turning, simple sound playing, variables, advanced costume handling, miscellaneous, layers, expert math, detect conditions, advanced events, advanced loops, text handling, music and instruments, simple costume handling, graphic effects, program control, conditional loops, string handling, advanced math,