I took the index of your words, converted the range to binary, additional 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, included a few zeros for the 8 digits in the binary and received 00000010011 which interprets to 19 https://geilebookmarks.com/story18838833/the-invalid-bip39-phrase-diaries