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Let’s be good porters!
Do you know what a castle looks like? Some castles were built with moats of water and drawbridges. Many others had a big locked-and-barred door.
If you were a person who didn’t belong in the castle, would the person guarding the door just let you come in? I don’t think so! If you wanted to get in, and were planning to do something bad, you might try to lie to trick the person at the door to let you inside. The person at the door always had to be alert.