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Engaged column s are rarely found in classical Greek architecture , and then only in exceptional cases , but in Roman architecture they exist in profusion , most commonly embedded in the cella walls of pseudoperipteral buildingsEngaged columns serve a similar function as wall buttresses but are distinct from pilasters , which by definition are ornamental and not structural .
 None
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:  
Answer:
 None