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A Marilyn is any mountain in Britain or Ireland with a prominence over 150m, regardless of height.
A Hump (Hundred and upwards Metre Prominence) is any mountain in Britain or Ireland with a prominence over 100m, regardless of height.
A Simm is any mountain in Britain or Ireland with a prominence over 30m and a height above 600m.
A Dewey is a mountain in England, Wales or the Isle of Man with a height between 500m and 610m and a prominence greater then 30m
