I took the index from the words, transformed the quantity to binary, extra three zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, extra a few zeros to your 8 digits of the binary and acquired 00000010011 which interprets to 19 in https://socialbuzzfeed.com/story4465242/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase