I took the index of the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, included three zeros towards the 8 digits of your binary and obtained 00000010011 which translates to 19 in https://socialbuzzmaster.com/story4427686/bip39-seed-phrase-fundamentals-explained