The leader of the Pheu Thai party and the leaders of five other parties say they believed they had won more than 250 seats in the 500-seat lower house.
Although the military-crafted constitution puts pro-democratic forces at a disadvantage, the pro-military parties still have a long way ahead to form the new government.
Thailand will hold a much-delayed general election on February 24, 2019, nearly five years after a military junta took power in a coup and imposed a ban on political activity.
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