I took the index from the words, transformed the number to binary, additional a few zeros, calculated the sha256 digest, took the main Section of the hexadecimal to convert it to binary, included three zeros on the eight digits on the binary and bought 00000010011 which interprets to 19 in https://bookmark-media.com/story19700045/an-unbiased-view-of-bip39-seed-phrase-github