https://readscore.plainlicense.org/https://readscore.plainlicense.org/choosing-a-metric/https://readscore.plainlicense.org/guides/extending/https://readscore.plainlicense.org/metrics/https://readscore.plainlicense.org/metrics/ari/https://readscore.plainlicense.org/metrics/coleman-liau/https://readscore.plainlicense.org/metrics/dale-chall/https://readscore.plainlicense.org/metrics/flesch-kincaid/https://readscore.plainlicense.org/metrics/flesch/https://readscore.plainlicense.org/metrics/gunning-fog/https://readscore.plainlicense.org/metrics/linsear-write/https://readscore.plainlicense.org/metrics/smog/https://readscore.plainlicense.org/metrics/spache/https://readscore.plainlicense.org/reference/example/