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Re:2x 40 min of train everyday. Best way to spend them? by wanda on Tuesday January 14, 2014 @08:10AM (#7056768)
Project Euler. That's what I used to do while commuting to London.

https://projecteuler.net/problems

Re:2x 40 min of train everyday. Best way to spend them? by dgellow on Tuesday January 14, 2014 @08:18AM (#7056803)
I started doing the exercises as a way to learn Clojure some time ago. I can pick up where I had left.

Thanks for the idea.