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		//create both example trees
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		//create both example trees
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		UnorderedTree tree1 = createTreeOne();
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		UnorderedTree tree1 = createTreeOne();
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		UnorderedTree tree2 = createTreeTwo();
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		UnorderedTree tree2 = createTreeTwo();
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		tree1.printPreOrder(  System.out );
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		tree1.printPreOrder( System.out );
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		tree1.printPostOrder( System.out );
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		tree1.printPostOrder( System.out );
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		tree1.printLevelOrder( System.out );
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		System.out.println(); //blank line
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		System.out.println(); //blank line
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		tree2.printPreOrder(  System.out );
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		tree2.printPreOrder( System.out );
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		tree2.printPostOrder( System.out );
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		tree2.printPostOrder( System.out );
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		tree2.printLevelOrder( System.out );
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	}
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	}
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	//method to create and return tree 1
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	//method to create and return tree 1
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	public static UnorderedTree createTreeOne( ) {
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	public static UnorderedTree createTreeOne( ) {
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