I took the index on the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, added 3 zeros to the eight digits from the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkprobe.com/story19294197/considerations-to-know-about-bip39-seed-phrase-generator