this is the commented version of my previous entry (solution 181910)
this is my original submission modified for ease of reading
whoops, didn't see your thing about "easy to understand code."
Tune your guitar
Back to basics 11 - Max Integer
Replace all zeros and NaNs in a matrix with the string 'error'
Next Lower Power of B
Area of an equilateral triangle
String substitution, sub problem to cryptoMath
Make a simplified barcode
Project Euler: Problem 3, Largest prime factor
Project Euler: Problem 6, Natural numbers, squares and sums.
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