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The development of Heck reaction with aliphatic halides although has made significant progress in the past decade and particularly recently , it was much less explored in comparison with the aryl halides .
 Chemical: aliphatic halides; Chemical: aryl halides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: aliphatic halides; Chemical: aryl halides