I took the index on the words, transformed the amount to binary, extra three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, additional a few zeros towards the 8 digits on the binary and bought 00000010011 which translates to 19 in https://mediasocially.com/story3999654/a-secret-weapon-for-bip39-words-to-numbers