I took the index of the words, transformed the selection to binary, additional three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, added 3 zeros to your 8 digits of your binary and received 00000010011 which interprets to 19 in https://socialmediaentry.com/story4244208/a-review-of-bip39-phrase-list