Two South Sudanese generals who were arriving near the towns said the airstrikes marked "a clear escalation" by Sudan, he said.

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Combined with a new survey of the top 30 US angel investment groups that shows a marked increase across the board in seed stage valuations for startups, it is clear that the innovation economy is continuing its steady growth that began over three years ago.

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Each marked line was filled in by hand in trademark Bugatti blue and a five layer coat of clear lacquer.

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