I took the index on the words, transformed the amount to binary, included 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, added three zeros towards the 8 digits of the binary and bought 00000010011 which translates to 19 in decimal. https://worldlistpro.com/story20944665/bip39-seed-phrase-fundamentals-explained