| http://www.w3.org/ns/prov#value | - For example, the lower surface may be hairy (many different technical words are used to describe the hairiness of a leaf) ??? but do look to see whether there are hairs on either or both surfaces), or if the surfaces are a different colour / shade, or look at the veins of the two surfaces, they may be more obvious on one surface ??? raised or sunken.
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