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LONDON, July 3 (Reuters) - Britain's FTSE 100 headed for a steady open on Friday after gaining in the previous two sessions, according to financial bookmakers. For more on the factors affecting European stocks, please click on
* The UK blue chip index closed 0.3 percent higher at 6,630.47 points on Thursday.
* Oil prices dropped as a rising U.S. rig count stoked fears of oversupply and after Chinese regulators opened an investigation into suspected stock market manipulation.
* London copper was set for a second weekly rise on Friday, underpinned by prospects of a demand recovery later in the year and as short holders closed positions, but traders said concerns over Greece and slowing growth in China would crimp gains.
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