I took the index from the words, transformed the selection to binary, added three zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to convert it to binary, added a few zeros towards the 8 digits on the binary and bought 00000010011 which translates to 19 in https://bookmarkgenius.com/story19029355/5-essential-elements-for-bip39-explained