I took the index on the words, converted the range to binary, added three zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to convert it to binary, extra a few zeros on the eight digits of the binary and got 00000010011 which interprets to 19 https://mylittlebookmark.com/story4572731/an-unbiased-view-of-bip39-seed-phrase-github