I took the index on the words, transformed the quantity to binary, additional a few zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to convert it to binary, added 3 zeros for the 8 digits of the binary and acquired 00000010011 which interprets to 19 in https://mnobookmarks.com/story18882808/fascination-about-invalid-bip39-phrase