I took the index from the words, converted the amount to binary, additional 3 zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, included a few zeros to the 8 digits of the binary and got 00000010011 which interprets to 19 in https://bookmarkinglife.com/story4485437/bip39-phrase-generator-can-be-fun-for-anyone