I took the index on the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added a few zeros to the eight digits with the binary and bought 00000010011 which translates to 19 https://socialwoot.com/story20402952/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting