I took the index with the words, converted the number to binary, extra 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, included 3 zeros for the eight digits in the binary and got 00000010011 which translates to 19 in decimal. https://socialeweb.com/story4187584/5-simple-techniques-for-bip39-seed-phrase