I took the index of your words, transformed the variety to binary, extra three zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to convert it to binary, additional a few zeros on the 8 digits from the binary and received 00000010011 which interprets to 19 in https://bookmarkfly.com/story18971269/bip39-phrase-generator-can-be-fun-for-anyone