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Bissau/June 28 - A voter in Guinea-Bissau casts his ballot in the country's presidential election on June 28. The West African nation is one of the poorest on the continent--it is ranked 171 out of 179 nations in the U.N. Development Programme's Human Development Index, and life expectancy at birth is less than 46 years. The election comes four months after the leader João Bernardo Vieira was killed by mutinous troops..