I took the index from the words, converted the range to binary, included three zeros, calculated the sha256 digest, took the very first Section of the hexadecimal to transform it to binary, included three zeros to the 8 digits of the binary and bought 00000010011 which interprets to 19 in https://socialrator.com/story9739099/the-ultimate-guide-to-bip39-seed-phrase-github