I took the index from the words, transformed the variety to binary, added 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, extra three zeros to the 8 digits of the binary and received 00000010011 which translates to 19 in https://directmysocial.com/story3694255/examine-this-report-on-bip39-mnemonic-phrase-tool