I took the index with the words, converted the selection to binary, additional a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, included 3 zeros into the 8 digits with the binary and received 00000010011 which translates to 19 in https://bookmarkworm.com/story18948162/the-5-second-trick-for-ledger-seed-phrase-bip39