I took the index from the words, transformed the variety to binary, extra a few zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, added 3 zeros towards the eight digits of the binary and received 00000010011 which interprets to 19 in https://mixbookmark.com/story4397389/bip39-seed-phrase-mnemonics-generator-an-overview