{HEAD ~ Adjustable ring structure} is provided in accordance with the teachings of {TAIL ~ the present invention} wherein a ring shank is hinged to define first and second arcuate elements having an aperture therebetween 
{ HEAD ~ Adjustable ring structure } is provided in accordance with the teachings of { TAIL ~ the present invention } wherein a ring shank is hinged to define first and second arcuate elements having an aperture therebetween
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