| http://www.w3.org/ns/prov#value | - No two pieces (clefts) are the same, even from the same tree - the individual cell structure, natural density and weight will all vary according to the tree???s speed of growth, its habitat, its moisture content, the prevailing wind and whether its north or south facing.Heavy willow tends to be denser, less prone to damage and inherently more powerful than a light piece of willow, although a light
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