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Add more tests for REPEAT, particularly that bad input errors are recoverable.

Add a comment to explain why graphics.h must still be included.

Stop including graphics.h, since it's no longer needed.

Stop including graphics.h, since it's no longer needed.

Stop including graphics.h, since it's no longer needed.

Stop including graphics.h, since it's no longer needed.

Stop including graphics.h, since it's no longer needed.

Stop including graphics.h, since it's no longer needed.

Stop including graphics.h, since it's no longer needed.

Stop including graphics.h, since it's no longer needed.