It’s as easy to learn as your ABCs

Imagine, you’ve come down to the final reveal in A Study in Scarlet. The famed Sherlock Holmes stands in the room where the murder happened, all eyes awaiting his recounting of events. “A-ha, it’s elementary, my dear Watson,” says Holmes. “I know who killed Joseph Stangerson, and more importantly, how they did it. It was Jefferson Hope, and he did it with this!”
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https://www.pcworld.com/article/3530367/murder-by-numbers-review-come-for-the-picross-stay-for-the-pi-crimes.html