I took the index from the words, transformed the selection to binary, additional three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, included a few zeros for the 8 digits on the binary and bought 00000010011 which translates to 19 in https://bookmarkunit.com/story18714956/little-known-facts-about-bip39-seed-phrase-list