I took the index on the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added 3 zeros towards the 8 digits from the binary and bought 00000010011 which interprets to 19 in https://kingslists.com/story20874148/bip39-phrase-generator-can-be-fun-for-anyone