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java-core-examples/copying/output/12-graph-copy.txt
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== 1. Diamond: root.left and root.right are the same node ==
original : left == right : true
copy constructor : left == right : false
identity-map copy : left == right : true
serialization copy : left == right : true
== 2. Cycle: a -> b -> a ==
original : a.left.left == a : true
copy constructor : StackOverflowError
identity-map copy : copy.left.left == copy : true
identity-map copy : copy != original : true