I took the index from the words, converted the selection to binary, added three zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, added three zeros towards the 8 digits with the binary and bought 00000010011 which interprets to 19 in decimal. https://bookmarkshome.com/story4588059/getting-my-bip39-words-to-numbers-to-work