I took the index in the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to convert it to binary, included three zeros for the eight digits in the binary and acquired 00000010011 which interprets to 19 in decimal. https://zanybookmarks.com/story18942530/not-known-factual-statements-about-bip39-explained