"Someone might ask, isn't such a simple code easy to expose?"
"Well, as I mentioned before, it's more than enough to deal with ordinary people."
"For instance, you're facing someone who plays mahjong with his right hand; his left hand is usually placed naturally on the left side of the mahjong tiles in front of him, and sometimes he'd rest his fingers lightly on the top of a few left-side tiles while thinking about his play... Actions like these are common habits. Do you find anything unusual in them?"
