greenfoot.collision is used in

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ClassQuery
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CollisionChecker
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CollisionProfiler
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CollisionQuery
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ColManager
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GOCollisionQuery
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GridCollisionChecker . Cell . GridWorld . Statistics
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InRangeQuery
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PointCollisionQuery
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CommonTest
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GetAtTest . BadLeaf
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InRangeTest
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IntersectionTest
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NeighbourTest
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SubClassTests . SuperClass . SubClass . IndependentClass