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Japan’s Nikkei jumped 5.7% after its worst two-day performance since 1987. However, investor sentiment in the region remains uncertain, given the ongoing crisis at the crippled Fukushima Daiichi nuclear plant. Other indexes also showed gains. The Shanghai Composite added 1.2%, South Korea’s Kospi gained 1.8%, and Hong Kong’s Hang Seng had a 0.1% rise. European stocks have had modest declines. Traders have taken cues from a downgrade of Portugal’s debt, with Moody’s...