I took the index from the words, transformed the amount to binary, added a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, additional 3 zeros for the eight digits of the binary and got 00000010011 which interprets to 19 in https://socialbookmarkgs.com/story18855795/examine-this-report-on-bip39-passphrase