I took the index from the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to transform it to binary, added three zeros towards the eight digits of your binary and obtained 00000010011 which interprets to 19 in https://bookmarkmoz.com/story18867414/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator