I took the index on the words, converted the variety to binary, extra a few zeros, calculated the sha256 digest, took the initial part of the hexadecimal to convert it to binary, added three zeros to your eight digits of your binary and bought 00000010011 which interprets to 19 in https://bookmarkoffire.com/story18732349/an-unbiased-view-of-bip39-seed-phrase-github