I took the index from the words, transformed the quantity to binary, added three zeros, calculated the sha256 digest, took the main Component of the hexadecimal to convert it to binary, additional 3 zeros on the eight digits of the binary and bought 00000010011 which interprets to 19 in decimal. https://checkbookmarks.com/story4330960/an-unbiased-view-of-bip39-seed-phrase-github