I took the index with the words, transformed the variety to binary, included 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, added three zeros for the eight digits of the binary and bought 00000010011 which translates to 19 in decimal. https://thegreatbookmark.com/story18874140/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator