| http://www.w3.org/ns/prov#value | - The ends can be drawn towards one another by any suitable means, including a mechanical or magnetic force, or by a differential expansion effect, for example where the strip consists of laminates of materials that contract or expand differently from one another when exposed to a stimulus, such as heat (thermal expansion) or water (e.g., top layer of strip hydrophilic while bottom layer hydrophobic
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