I took the index of the words, converted the selection to binary, included 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, extra three zeros towards the eight digits of your binary and received 00000010011 which interprets to 19 in decimal. https://monobookmarks.com/story18943353/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition