| http://www.w3.org/ns/prov#value | - Also, structures, such as ribs and indentations may be included in the flap design to tailor the spring constant. [0033] Preferably, the teats extend from a common base, the base being integral with the teats. [0034] Preferably, to give the desired flexibility, the teats and base are made of a material which is as soft as possible.
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