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The 6 January Dictatorship ( , , ) was a royal dictatorship established in the Kingdom of Serbs , Croats and Slovenes by King Alexander .
 Kingdom of Serbs , Croats and Slovenes, King Alexander
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kingdom of Serbs , Croats and Slovenes, King Alexander