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Contrary to existing greedy techniques , these tasks are posed in the form of a discrete global optimization problem with a well defined objective function .
 compare: greedy techniques, tasks; feature of: discrete global optimization problem, tasks; feature of: well defined objective function, discrete global optimization problem
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  greedy techniques, tasks; discrete global optimization problem, tasks; well defined objective function, discrete global optimization problem 
Answer:
 compare: greedy techniques, tasks; feature of: discrete global optimization problem, tasks; feature of: well defined objective function, discrete global optimization problem