I took the index with the words, converted the quantity to binary, added 3 zeros, calculated the sha256 digest, took the initial A part of the hexadecimal to transform it to binary, additional three zeros towards the 8 digits in the binary and bought 00000010011 which translates to 19 in https://funny-lists.com/story19942731/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition