I took the index of the words, converted the number to binary, included a few zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to convert it to binary, included 3 zeros to the eight digits of the binary and got 00000010011 which translates to 19 in https://bookmarkfavors.com/story4464702/5-simple-techniques-for-bip39-seed-phrase