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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): "I think people are shorting this stock, but I think copper demand will surprise people."

Nice Systems ( NICE): "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.

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