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The main catalyst for its transformation from a small town into a big city was the demand for coal required in making iron and later steel , brought to the sea by packhorse from Merthyr Tydfil .
 location: Merthyr Tydfil
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: Merthyr Tydfil 
Answer:
 location: Merthyr Tydfil