Holy smokes! I had to look at this code for about 2 hours to understand it. I see now that build_path always returns a list (array), but usually only with 1 element. I also see that you're using several anonymous arrays for each iteration. It also took me a while to see how you're switching between lists and scalars back and forth. This code is very efficient. It works brilliantly for me now, and I thank you very much for the enlightenment!
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