I took the index from the words, transformed the number to binary, extra a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, added three zeros towards the 8 digits from the binary and bought 00000010011 which interprets to 19 in https://bookmarksusa.com/story18882557/top-guidelines-of-bip39-word-list-pdf