I took the index on the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, included 3 zeros into the 8 digits on the binary and obtained 00000010011 which interprets to 19 in decimal. https://techonpage.com/story4384199/the-greatest-guide-to-seed-phrase-bip39