So far, strong resistance above the somewhat magnetic 1.3100 level is limiting recovery attempts.

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The SPD has ruled out forming an alliance with the radical Left Party at the federal level, limiting Mr Steinmeier's coalition options.

BBC: 'Merkel factor' could decide German vote

Limiting information in this way could help level the playing field, experts say.

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While the ozone layer in the upper atmosphere plays an important role in limiting harmful ultraviolet light reaching the Earth's surface, low-level ozone is a pollutant that is harmful, causing respiratory problems in animals as well as well-documented cases in humans.

BBC: Invasive plant 'increases ozone pollution'

The level of success of these technologies will be country-specific so unlike other limiting factors, success and failure will be local.

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At secondary level, educational opportunities in much of the region are deeply limited -- and limiting.

CNN: Africa 'must think big for its children'