| http://www.w3.org/ns/prov#value | - Any region tagged with a contents label B which is not a subset of A cannot share any of the boundary of A, and so cannot be affected by any change to the boundary of A. For B not to be a subset of A, a leaf node contents label must contribute to B which does not contribute to A. If the leaf node contents label is termed CM, then CM does not contribute to A, and A is a peak.
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