I took the index in the words, transformed the quantity to binary, included a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, extra three zeros towards the 8 digits of the binary and got 00000010011 which interprets to 19 in https://iowa-bookmarks.com/story14815521/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator