| http://www.w3.org/ns/prov#value | - A device may have a dispenser with one particular shaped and sized gradient-forming element, and another with another set of parameters, for example, a device comprising a form of chlorine for disinfecting a swimming pool may have one dispenser with no gradient-forming element, the dispenser containing the amount of chlorine necessary to ???shock??? the pool, for example, after a period of non-use
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