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show me films set in world war i released in the 1970s
 plot: world war i; year: 1970s
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: genre, year, plot, average ratings, actor, title, song, character, rating, review, director, trailer 
Text: {0} 
 Entities: world war i, 1970s 
Answer:
 plot: world war i; year: 1970s