Potential answers for "Smooth engine sounds"

⭐⭐⭐⭐ PURRS
⭐⭐⭐ HUM
⭐⭐⭐ PURR
⭐⭐ ROARS
⭐⭐ PUTTPUTTS
⭐⭐ VROOMS
⭐⭐ CLANKY
⭐⭐ PINGS

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