I took the index in the words, transformed the range to binary, added a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, extra three zeros to the 8 digits of the binary and got 00000010011 which interprets to 19 in https://mysocialport.com/story4472651/little-known-facts-about-bip39-seed-phrase-list