I took the index with the words, converted the selection to binary, added a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, added a few zeros on the 8 digits of your binary and bought 00000010011 which translates to 19 https://thebookmarkking.com/story19108032/the-greatest-guide-to-seed-phrase-bip39