I took the index on the words, transformed the range to binary, added 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, additional a few zeros towards the 8 digits in the binary and bought 00000010011 which translates to 19 in https://wearethelist.com/story20916473/the-ultimate-guide-to-bip39-seed-phrase-github