I took the index of the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to transform it to binary, added 3 zeros towards the 8 digits on the binary and received 00000010011 which interprets to 19 in https://mnobookmarks.com/story18778261/facts-about-bip39-seed-phrase-word-list-revealed