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In 1998 , " Allgame " called it one of the more " polite " shoot'em ups for its detailed visuals , challenge and unique enemy designs , finding it to have a " charm " unmatched by other games of the genre .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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