(This story corrects period for sales in the first paragraph) By Nguyen Phuong Linh HANOI (Reuters) - - Communist Vietnam is suddenly Apple Inc's hottest market after sales there tripled in its fiscal first half, a growth rate five times faster than in India where it is spending heavily in a battle for market share. Vietnam has barely received a mention from Apple executives in their regular briefings for financial analysts. Quarterly iPhone sales more than doubled and the strong growth appears likely to continue given Vietnam's predominantly young, tech-savvy population, rapid growth in internet and mobile phone use and a projected doubling of the middle class by 2020.

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