I took the index of the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, added 3 zeros towards the 8 digits in the binary and bought 00000010011 which translates to 19 in decimal. https://7prbookmarks.com/story19053109/bip39-seed-phrase-mnemonics-generator-an-overview