I took the index from the words, transformed the selection to binary, additional a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, added 3 zeros towards the eight digits from the binary and received 00000010011 which interprets to 19 in https://e-bookmarks.com/story4564127/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting