I took the index in the words, converted the selection to binary, included three zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to transform it to binary, extra 3 zeros for the 8 digits in the binary and obtained 00000010011 which translates to 19 in https://total-bookmark.com/story18785546/invalid-bip39-phrase-things-to-know-before-you-buy