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Thank you, It seems like it works but there is an error:

Could not find robocode/AdvancedRobot.class on Classpath
Could not find robocode/Condition.class on Classpath

I understood the error but not sure about what to do.

I am not sure either, I never saw this error before.

If it won't work, you could also try using other shrinking software, there are a lot of tools available.