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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" Monday evening. Threshold Pharmaceuticals ( THLD: "If you make this the speculative part of your portfolio, I'll say buy, buy, buy." Leucadia National ( LUK: "You can't really explain what Leucadia is. It's too hard to understand." Kodiak Oil & Gas ( KOG: "They have tons of oil and that makes them a winner." MedcoHealth Solutions ( MHS: "Some people are concerned about the merger. I say buy, buy, buy." Freeport-McMoRan ( FCX - Get Report): "I think people are shorting this stock, but I think copper demand will surprise people." Nice Systems ( NICE - Get Report): "I like security and I like Nice." Perfect World ( PWRD: "This is a Chinese stock, so I can't endorse it." Tempur-Pedic ( TPX: "This one is a good one. It's a winner." --Written by Scott Rutt in Washington, D.C. To contact the writer of this article, click here: Scott Rutt. Follow TheStreet on Twitter and become a fan on Facebook. To submit a news tip, send an email to: firstname.lastname@example.org.