Room
You put a roof over the ground to make your own private patch of dirt. This is your room! That's really all a room is, you know? A covered, private place where you can have some time to yourself.
しつ
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The only problem with your room is that you can't always be alone. Because of your dad's shih tzu (しつ). The shih tzu likes to come into your room and pee everywhere. Ruining your privacy completely.