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NEW YORK ( TheStreet) -- Here's what Jim Cramer had to say about some of the stocks that callers offered up during the "Mad Money Lightning Round" Friday evening. 3Com Corporation ( COMS): "This is one of the great communications stocks out there. I think you should hold onto it till $7." VIVUS ( VVUS): "This is very, very speculative and I'll endorse it only because its Speculative Friday." Rubicon Minerals ( RBY): "When we think minerals, we think Freeport-McMoRan ( FCX) or Agnico-Eagle Mines ( AEM). Your play should be sold."