I took the index with the words, transformed the selection to binary, included three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, extra a few zeros into the 8 digits on the binary and got 00000010011 which interprets to 19 in https://thesocialvibes.com/story4292302/the-greatest-guide-to-seed-phrase-bip39