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The market runs in patterns, Jim Cramer said on his

"RealMoney" radio show Friday. It can tell you when it is time to buy and when it's time to sell, he said.

Friday is a textbook day, Cramer said. The market rallied

early because Europe did, and Europe rallied because we did. Then the market went down, he said.

"I like to only buy a stock when I can see the white in its eyes," he said.

"If you missed the opportunity to buy the stock yesterday you have to wait," Cramer said. "Just watch it and be patient."

"I like to buy the one or two stocks that did not rally," he said, adding that he believes any company that is in the machinery business could do well. Cramer also told listeners to take a look at the oil or supermarkets.

If you stay in machinery, oil or supermarkets you should be fine, but there are some consumer stocks that are being given up, he said.

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