| http://www.w3.org/ns/prov#value | - The material of the core 23 may be substantially flexible, e.g., manufactured in a desired annular shape, yet easily deformed, e.g., deflected, stretched, and/or compressed, as demonstrated in FIGS. 9A and 9B. Exemplary materials for the core include silicone or other elastomeric materials, foam, fabric, felt, polymers, and the like, e.g. similar to the sewing cuff 20.
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