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This web page dhcelebrity.blogspot.com states the following, "Secret Codes of Leonardo Da Vinci." We saw that the webpage said " Posted by Denny Hakim Mannuragie." It also said " Thursday, February 13, 2014. Secret Codes of Leonardo Da Vinci. Who does not know Leonardo Da Vinci. A character who has a lot of mystery with secret codes. One of the results of his work which made everyone very impressed that the Mona Lisa. Hide an invisible symbol? Is it really a symbol created by Da Vinci or just a fluke shaped scratches? And if Da Vinci is not easy to give instructions to all the mysteries that he created?." The header had seo as the highest ranking optimized keyword. It is followed by seo friendly and blogger template which isn't as ranked as highly as seo.