I took the index of your words, transformed the range to binary, additional a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, additional three zeros towards the eight digits on the binary and bought 00000010011 which translates to 19 in https://bookmarkswing.com/story20236583/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting