It's too simple, writes hacker Robert Hansen, also known as rSnake, to find the source of the images, index them with the same tools the CAPTCHA-builders used and exploit that index to break the puzzle.

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The 200-day is a major, major support level, so its important to see how a stock or index handles a break of it over the subsequent 1-3 days.

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The 500-stock index shuffled around the break-even mark, down 4 points at 1, 565 an hour into the session, while the Dow Jones industrial average slipped 5 points to 14, 573.

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However, a mid-morning ISM manufacturing index slid to just above the critical break-even reading and further than investors were braced for indicating a further stall in economic activity even if only in the less important sector.

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The ray of hope will break through if Morgan Stanley Capital International's popular international stock index is altered, perhaps in early December, to place more weight on the percentage of a firm's shares that are publicly traded.

ECONOMIST: Asia’s rollercoaster rides | The

The pullback in the Nikkei on Thursday started with modest declines that picked up steam after Tokyo's lunch break, with stocks finishing the day at the session low, for the index's biggest one-day retreat in two years.

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Chart Analysis : The iShares MSCI Japan Index ( EWJ) gapped lower on Thursday and is likely to show another down gap Friday and break the daily uptrend, line a.

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