What are the grades of murmur intensity (Levine scale)?

Grade 1	Heard by an expert in optimum conditions
Grade 2	Heard by a non-expert in optimum conditions
Grade 3	Easily heard, no thrill
Grade 4	Loud murmur, palpable thrill
Grade 5	Very loud murmur, often heard over a wide area, palpable thrill
Grade 6	Extremely loud, heard without a stethoscope

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