I took the index from the words, transformed the number to binary, included 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, included 3 zeros towards the 8 digits in the binary and received 00000010011 which translates to 19 in decimal. https://artybookmarks.com/story18681678/bip39-seed-phrase-mnemonics-generator-an-overview