I took the index with the words, converted the range to binary, added a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, added 3 zeros towards the eight digits of your binary and acquired 00000010011 which interprets to 19 in https://businessbookmark.com/story4425931/considerations-to-know-about-bip39-seed-phrase-generator