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Two types of structures have been considered : a carbene structure where an intact CH2 fragment is bound to the metal ( M + - CH2 ) and a carbyne ( hydrido - methylidyne ) structure with both a CH and a hydrogen bound to the metal separately ( H - M + - CH ) .
 Chemical: carbene; Chemical: CH2; Chemical: CH2; Chemical: carbyne; Chemical: hydrido - methylidyne; Chemical: CH; Chemical: hydrogen; Chemical: H; Chemical: CH
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: carbene, CH2, CH2, carbyne, hydrido - methylidyne, CH, hydrogen, H, CH 
Answer:
 Chemical: carbene; Chemical: CH2; Chemical: CH2; Chemical: carbyne; Chemical: hydrido - methylidyne; Chemical: CH; Chemical: hydrogen; Chemical: H; Chemical: CH