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It is a phrase indicating a form of relationship.
Alan Bennett's concise stories bear the same relationship to a novel [a long narrative] as a short story [a short narrative] does. They are both narratives but one is extensive, the other is concentrated.
So whatever the TV series is, it contains a sequence of individual episodes linked by a character, whereas "TV narrative" will be a continuous sequence based on a character. Both are TV series, but one has an ongoing theme and the other is single episodes about a character.
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