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a lamp holder structure of the present invention is comprised of : a cup-shaped base ; a circuit board and two elastic conducting devices mounted inside the cup-shaped base ; and at least one light-emitting device mounted on the circuit board .
 structure, base
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
Answer:
 structure, base