I took the index on the words, transformed the range to binary, added three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, extra a few zeros towards the 8 digits with the binary and bought 00000010011 which translates to 19 in https://toplistar.com/story21461684/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting