I took the index of your words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, included 3 zeros for the eight digits of the binary and bought 00000010011 which translates to 19 in https://bookmarkedblog.com/story19689880/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool