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Using this concept , we have prepared a halogen bond donor bis ( urea ) gelator that forms co - gels with halogen bond acceptors .
 Chemical: halogen; Chemical: bis ( urea ); Chemical: halogen
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: halogen; Chemical: bis ( urea ); Chemical: halogen