I took the index of your words, converted the amount to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added 3 zeros into the eight digits of the binary and acquired 00000010011 which interprets to 19 in https://sb-bookmarking.com/story19098232/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting