I took the index on the words, converted the selection to binary, added three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, included 3 zeros to your eight digits in the binary and acquired 00000010011 which interprets to 19 in decimal. https://echobookmarks.com/story18837065/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition