Potential answers for "Run smoothly, as an engine"

⭐⭐⭐⭐ PURR
⭐⭐⭐⭐ HUM
⭐⭐⭐⭐ PURRLIKEAKITTEN
⭐⭐⭐ FLOW
⭐⭐⭐ DEBUG
⭐⭐⭐ PURRS

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