What are 'A, B, and C stories' in a TV drama?

What are 'A, B, and C stories' in a TV drama?

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A, B, and C stories are parallel, unrelated stories that are usually attached to different members of the main continuing cast and are not sub-plots. Although these stories exist within the same world, they are not contingent on each other and can be laid out separately as entire arcs or quests or developments for that show.