I took the index of the words, converted the range to binary, added a few zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, added three zeros towards the 8 digits from the binary and received 00000010011 which interprets to 19 https://hyperbookmarks.com/story18810463/bip39-phrase-generator-can-be-fun-for-anyone