I agree that the why is important, and it reinforces understanding of the how. I share your frustration when I see technical tutorials that show a bunch of scre

I agree that the why is important, and it reinforces understanding of the how. I share your frustration when I see technical tutorials that show a bunch of screenshots or make you type a bunch of command line actions without explaining what it does and why you should do it. In this case though, I chose to omit the why because other written resources on QR Codes have covered the topics extensively. Just to name a few: https://en.wikipedia.org/wiki/QR_code https://en.wikipedia.org/wiki/QR_code ; http://datagenetics.com/blog/november12013/index.html http://datagenetics.com/blog/november12013/index.html ; https://en.wikipedia.org/wiki/Error_correction_code#Interleaving https://en.wikipedia.org/wiki/Error_correction_code#Interlea... ; https://en.wikipedia.org/wiki/Clock_recovery https://en.wikipedia.org/wiki/Clock_recovery