I took the index on the words, converted the quantity to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, included 3 zeros to the 8 digits in the binary and bought 00000010011 which translates to 19 in https://top100bookmark.com/story19640678/fascination-about-bip39-english-words