I took the index on the words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, added a few zeros towards the 8 digits in the binary and received 00000010011 which interprets to 19 https://getsocialselling.com/story5041922/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator