I took the index with the words, converted the amount to binary, included a few zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits of your binary and got 00000010011 which translates to 19 https://guidemysocial.com/story4305247/new-step-by-step-map-for-bip39-english-words