The look command can be used in two ways. If you specify something or somebody to look at, you will see that person or object's description. If you do not specify anything, you will see your current location's description (typing 'look here' is the same as simply typing 'look').
If you type 'look' right now, you will see these instructions again, because they are the description of this room. The last line you see should be, "You see a small mailbox here.", because there is a mailbox in this room. Type 'look mailbox' now, and follow the instructions in its description.
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