Potential answers for "Ran smoothly, as an engine"

⭐⭐⭐⭐ PURRED
⭐⭐⭐ PURRS
⭐⭐⭐ PURR
⭐⭐⭐ FLOWED
⭐⭐⭐ HUM
⭐⭐⭐ HUMMED
⭐⭐⭐ PURRING

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