Indians are voting in their tens of millions in a monthlong general election that creates huge logistical issues in the world's largest democracy. The first round of polling was held on April 16. There are a further five voting phases before the final count is due on May 16.
Prime Minister Manmohan Singh's Congress party, which currently leads the coalition government, seeks to retain power. But some of its political allies are reported to be forming other ties which could unseat Congress.
Here are some key facts and figures involved in the election. 
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