I took the index with the words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, added a few zeros into the eight digits with the binary and acquired 00000010011 which translates to 19 https://webnowmedia.com/story4236296/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting