Repetition

Since I have begun to reread Poul Anderson's and Gordon R Dickson's Sherlock Holmes pastiche, I considered posting my thoughts on the phrase, "Elementary, my dear Watson!" Fortunately, I first searched the blog to check whether I had already done so and found that I had done it twice, first in September 2013 and again in November of that same year. See here.

Both posts have the same title and begin by quoting Anderson's and Dickson's story, yet I had clearly forgotten the September post when I published the November post. This happened at least once before with two nearly identical posts on Starkadian mathematics although a search has located only one such post so the other must have a different title.

I have found the other mathematical post here by searching for "factorial N." So how much of the blog is repetition? Please feel free to search it and let me know!