I took the index from the words, converted the amount to binary, extra three zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, added three zeros towards the 8 digits in the binary and received 00000010011 which translates to 19 in decimal. https://bookmarkedblog.com/story19540529/bip39-phrase-generator-can-be-fun-for-anyone