And the style (or the missing comments) is really what makes it hard to read. I am fine with higher-order functions (I do that in Haskell all the time), and le

And the style (or the missing comments) is really what makes it hard to read. I am fine with higher-order functions (I do that in Haskell all the time), and letters for variables, but please, please, give your functions meaningful names. Or add a comment that explain what they do. Code is not only for the person writing it (who perfectly knows what the letters mean, at least for a short time after he or she wrote it). It's also for others who have to read it some day.