I took the index in the words, transformed the range to binary, added a few zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, extra 3 zeros into the 8 digits of the binary and received 00000010011 which translates to 19 in https://techonpage.com/story4183296/invalid-bip39-phrase-things-to-know-before-you-buy