I took the index from the words, converted the selection to binary, added a few zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, added three zeros on the eight digits on the binary and acquired 00000010011 which translates to 19 https://reallivesocial.com/story4506655/an-unbiased-view-of-bip39-seed-phrase-github