I took the index on the words, transformed the amount to binary, included 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, included three zeros into the 8 digits on the binary and received 00000010011 which translates to 19 in decimal. https://socialfactories.com/story4617635/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator