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See thread https://lists.apache.org/thread.html/96b30fa453e3724ac77bc685d35116e6ccffd8cebf508ed74481dc91@%3Cdev.tinkerpop.apache.org%3E
TINKERPOP-2313 Support query: g.E().properties().hasKey("xx") & hasValue("xx")
GitHub Pull Request #1222
GitHub Pull Request #1224