I took the index in the words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the main Section of the hexadecimal to convert it to binary, additional three zeros towards the eight digits of your binary and bought 00000010011 which translates to 19 in decimal. https://bookmarkspiral.com/story18837509/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator