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Formation of the Constitutional Convention The idea for a constitutional convention was first mooted by the Northern Ireland Office in its white paper The Northern Ireland Constitution , published on 4 July 1974 .
 location: Northern; location: Northern
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Northern, Northern 
Answer:
 location: Northern; location: Northern