I took the index in the words, converted the quantity to binary, added 3 zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, included 3 zeros towards the 8 digits of the binary and bought 00000010011 which interprets to 19 in decimal. https://cyberbookmarking.com/story19400217/facts-about-bip39-seed-phrase-word-list-revealed