I took the index from the words, converted the range to binary, extra three zeros, calculated the sha256 digest, took the primary Section of the hexadecimal to convert it to binary, extra a few zeros for the eight digits of the binary and bought 00000010011 which translates to 19 in https://bookmarkbirth.com/story19741936/an-unbiased-view-of-bip39-seed-phrase-github