I took the index with the words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to transform it to binary, extra 3 zeros to the 8 digits with the binary and bought 00000010011 which translates to 19 https://getsocialsource.com/story4196958/little-known-facts-about-bip39-seed-phrase-list