Bot knows all the words and chooses based on the word that will eliminate the most possibilities. That's when Bot's second choice sometimes makes me go "Huh?"....or do I misunderstand the bot algorithm?
When there are 50+ words, there's no way to duplicate Bot's thinking...it's just luck for us mortals...but when you get to a limited number of words, you look for commonalities, so your choice eliminates as many of the remaining words as possible.