I took the index in the words, converted the range to binary, added a few zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to transform it to binary, included three zeros for the 8 digits with the binary and got 00000010011 which translates to https://sb-bookmarking.com/story19214603/a-secret-weapon-for-bip39-words-to-numbers