I took the index with the words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, additional 3 zeros on the eight digits with the binary and bought 00000010011 which interprets to 19 in https://userbookmark.com/story18780277/the-definitive-guide-to-bip39-seed-phrase