Write a function that takes an array of integers and returns all unique triplets that sum to zero. Optimize to avoid duplicate triplets and analyze how your approach scales with input size.

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Write a function that takes an array of integers and returns all unique triplets that sum to zero. Optimize to avoid duplicate triplets and analyze how your approach scales with input size.

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