I took the index on the words, converted the variety to binary, extra a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, additional three zeros into the 8 digits on the binary and bought 00000010011 which translates to 19 in https://meshbookmarks.com/story18862981/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition