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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. ADC Telecommunications ( ADCT): "I've taken a lot of heat for this one, but I don't understand it at all. I'd be a buyer under $6 a share." Knight Trading Group ( NITE): "I got killed on this one. Their CEO told a good story and then they reported a bad quarter. We need to have the CEO back on. I think its cheap, but I'm not sure. "