I took the index in the words, transformed the variety to binary, additional a few zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, extra 3 zeros into the eight digits on the binary and obtained 00000010011 which interprets to 19 in https://freshbookmarking.com/story18821055/5-simple-techniques-for-bip39-word-list-pdf