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Stocks to Watch Friday  U.S. oil major ConocoPhillips is seeking to buy up to 25  percent in Russian oil giant LUKOIL &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LKOH.RTS target=/stocks/quickinfo/fullquote"&gt;LKOH.RTS&lt;/A&gt;, booking  billions of barrels of new reserves, an industry source  familiar with the matter said on Friday. ConocoPhillips shares  closed at \$72.70 on the New York Stock Exchange.   