I took the index of the words, converted the selection to binary, additional three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, extra a few zeros into the 8 digits of the binary and bought 00000010011 which translates to 19 in https://freshbookmarking.com/story18825676/5-essential-elements-for-bip39-explained