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The Badminton World Federation has charged eight female badminton Olympic players with "not using one's best efforts to win a match".

Four pairs of players - two from South Korea, one from China and one from Indonesia - could be disciplined.

China's Yu Yang and Wang Xiaoli and South Koreans Jung Kyung-eun and Kim Ha-na were accused after their match was booed by spectators.

Both pairs, who played each other, were already through to the quarter-finals.
Are they for real?