4651
Owing to the problem of insufficient training data and approximation error introduced by the language model , traditional statistical approaches , which resolve ambiguities by indirectly and implicitly using maximum likelihood method , fail to achieve high performance in real applications .
 insufficient training data, approximation error; statistical approaches, ambiguities; maximum likelihood method, statistical approaches
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 insufficient training data, approximation error; statistical approaches, ambiguities; maximum likelihood method, statistical approaches