I took the index of the words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, extra 3 zeros into the 8 digits in the binary and acquired 00000010011 which translates to 19 in https://bookmark-vip.com/story18970492/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting