I took the index from the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to convert it to binary, extra 3 zeros towards the 8 digits of the binary and got 00000010011 which translates to 19 in https://nimmansocial.com/story9398370/facts-about-bip39-seed-phrase-word-list-revealed