<!-- Size: 140 px -- >
<a href="http://www.clker.com/cliparts/D/H/O/b/p/r/graphene-th.png"><img src='http://www.clker.com/cliparts/D/H/O/b/p/r/graphene-th.png' alt='Ring clip art'/></a>
<!-- Size: 340 px -- >
<a href="http://www.clker.com/cliparts/D/H/O/b/p/r/graphene-md.png"><img src='http://www.clker.com/cliparts/D/H/O/b/p/r/graphene-md.png' alt='Ring clip art'/></a>
<!-- Size: 640 px -- >
<a href="http://www.clker.com/cliparts/D/H/O/b/p/r/graphene-hi.png"><img src='http://www.clker.com/cliparts/D/H/O/b/p/r/graphene-hi.png' alt='Ring clip art'/></a>
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