I took the index from the words, converted the number to binary, extra 3 zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to transform it to binary, added three zeros to the 8 digits on the binary and got 00000010011 which interprets to 19 https://doctorbookmark.com/story18896582/new-step-by-step-map-for-bip39-english-words