I took the index from the words, converted the range to binary, extra a few zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to convert it to binary, extra 3 zeros to the 8 digits on the binary and obtained 00000010011 which translates to 19 in https://top10bookmark.com/story18679498/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39