I took the index on the words, transformed the range to binary, added a few zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, included a few zeros for the 8 digits from the binary and bought 00000010011 which interprets to 19 https://highkeysocial.com/story4443512/little-known-facts-about-bip39-words