* https://abseil.io/resources/swe-book/html/ch16.html https://abseil.io/resources/swe-book/html/ch16.html * https://abseil.io/resources/swe-book/html/ch17.html

* https://abseil.io/resources/swe-book/html/ch16.html https://abseil.io/resources/swe-book/html/ch16.html * https://abseil.io/resources/swe-book/html/ch17.html https://abseil.io/resources/swe-book/html/ch17.html