I took the index in the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, additional a few zeros for the 8 digits on the binary and obtained 00000010011 which interprets to 19 in https://binksites.com/story8535035/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase