I took the index of your words, transformed the quantity to binary, added three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, added 3 zeros towards the 8 digits of your binary and received 00000010011 which translates to 19 in decimal. https://gogogobookmarks.com/story18796150/the-5-second-trick-for-ledger-seed-phrase-bip39