They have flags because a flag can show one of two things : The lords coat of arms, and so which noble owns the castle the colours of the lords mater for an example a kings coat of arms or a country's flag , showing where its allegiance lies.
I think etymology but I’m not sure
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The plot is the actual story around which the entire book is based. A plot should have a very clear beginning, middle, and end—with all the necessary descriptions and suspense, called exposition—so that the reader can make sense of the action and follow along from start to finish. Every story has a conflict to solve.
