I took the index in the words, transformed the range to binary, included 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, extra a few zeros for the 8 digits on the binary and bought 00000010011 which interprets to 19 in http://edgargvkh682.theburnward.com/from-mnemonics-to-security-understanding-bip39-passphrases-and-their-importance-in-copyright