I took the index in the words, converted the number to binary, included 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, included three zeros on the 8 digits of the binary and obtained 00000010011 which interprets to 19 in decimal. https://pr1bookmarks.com/story19038052/the-greatest-guide-to-seed-phrase-bip39