I took the index in the words, converted the number to binary, added three zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, included a few zeros into the 8 digits in the binary and obtained 00000010011 which interprets to 19 in https://www.slideserve.com/lewarthbfp/bip39-word-list-explained-your-essential-source-for-creating-secure-purses-in-t