I took the index from the words, transformed the amount to binary, additional 3 zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, added 3 zeros on the 8 digits in the binary and bought 00000010011 which interprets to 19 in decimal. https://bookmarklayer.com/story18878473/fascination-about-bip39-english-words