I took the index with the words, transformed the number to binary, extra a few zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to convert it to binary, additional a few zeros towards the 8 digits from the binary and obtained 00000010011 which translates to 19 https://bookmark-vip.com/story19053600/invalid-bip39-phrase-things-to-know-before-you-buy