I took the index on the words, transformed the range to binary, added 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, additional a few zeros to the 8 digits of the binary and obtained 00000010011 which translates to 19 in https://sound-social.com/story9619299/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator