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Split 'book/sca/' into commit '32ca606627901acde53e2e2e28b093339bb2780f'

git-subtree-dir: book/sca
git-subtree-mainline: f7d7a0d696ecea687caaf041eb98b34ad4e05c57
git-subtree-split: 32ca606627901acde53e2e2e28b093339bb2780f