I took the index in the words, converted the variety to binary, included a few zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, extra 3 zeros on the eight digits of your binary and bought 00000010011 which interprets to 19 in https://johsocial.com/story9184011/not-known-factual-statements-about-bip39-explained