VariableReferenceNode.java, OperationNode.java, ConstantNode.java, and PatternNode.java must have their own java classes with the correct methods implemented: OperationNode: Has enum, left and Optional right members, good constructors and ToString is good VariableReferenceNode: Has name and Optional index, good constructors and ToString is good Constant & Node Pattern: Have name, good constructor and ToString is good

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