I took the index with the words, converted the number to binary, included 3 zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, additional three zeros for the eight digits in the binary and received 00000010011 which interprets to 19 in https://bookmarkmoz.com/story18986537/little-known-facts-about-bip39-seed-phrase-list