csfieldguide/chapters/content/structure/coding-error-control/sections/sections.yaml
whats-the-big-picture:
section-number: 1
the-parity-magic-trick:
section-number: 2
check-digits-on-barcodes:
section-number: 3
qr-codes:
section-number: 4
the-whole-story:
section-number: 5
further-reading:
section-number: 6