I took the index in the words, transformed the variety to binary, additional three zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to convert it to binary, added 3 zeros to the 8 digits of your binary and bought 00000010011 which interprets to 19 in decimal. https://bookmarkcitizen.com/story19151019/a-review-of-bip39-phrase-list