greenfoot.core is used in

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ActInterruptedException
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AddToWorldHelper
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ExportedProjectProperties
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GNamedValue
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GreenfootLauncherDebugVM
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VersionCheckInfo
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ImageCache
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InternalGreenfootError
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PickActorHelper
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ProjectManager . ProjectAPIVersionAccess
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ProjectProperties
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ReadOnlyProjectProperties
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RemoveFromWorldHelper
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SetWorldHelper
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ShadowProjectProperties
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SimulationRunnable
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TextLabel
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WorldHandler