I took the index with the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, additional a few zeros towards the 8 digits of the binary and bought 00000010011 which interprets to 19 in https://bookmarkgenius.com/story18742473/getting-my-bip39-words-to-numbers-to-work