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Prime Minister Miro Cerar's SMC is projected to win 9.8%, followed closely by the Left (9.5%) and Social Democrats (9.3%).
New Slovenia (NSi) is projected at 6.6%, the Alenka Bratušek Party (SAB) 5.5% and Pensioners' Party (DeSUS) at 5%.
The far-right National Party (SNS) is projected to make a surprise return to parliament with 4.3%.
The exit poll was conducted by pollster Mediana for the broadcasters POP TV, TV Slovenija, Planet TV and web portal Siol on a sample of nearly 15,000 respondents.