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I think you're referring to this puzzle: http://datagenetics.com/blog/december12014/index.html

The version you gave is missing information and so can't be solved as stated.



Thank you for posting this. I read the parent several times trying to figure out if they were mistaken or I was dense.


I had to read that like 11 times before I started to get the underlying principle. That's amazing.


In a very similar vein, try this one: https://youtu.be/N5vJSNXPEwA




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