I took the index on the words, converted the selection to binary, included a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, added three zeros towards the 8 digits from the binary and bought 00000010011 which translates to 19 in https://nybookmark.com/story20391835/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator