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The polyelectrolytes examined in this part of the work are 3 , 3 - , 6 , 9 - , 6 , 12 - , and 12 , 12 - ionenes .
 Chemical: 3 , 3 - , 6 , 9 - , 6 , 12 - , and 12 , 12 - ionenes
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: 3 , 3 - , 6 , 9 - , 6 , 12 - , and 12 , 12 - ionenes