TASK DEFINITION: From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
PROBLEM: Given Relationship: 'invade', Sentence: 'He referred to the USA invading Iraq without cause and nothing being done about it .'

SOLUTION: invading

PROBLEM: Given Relationship: 'be service of', Sentence: 'See a list of publications by Mayo Clinic authors on mitral valve disease on PubMed , a service of the National Library of Medicine .'

SOLUTION: service

PROBLEM: Given Relationship: 'be size of', Sentence: 'Costa Rica is an agrarian country , the size of West Virginia , with a population of about 3 million .'

SOLUTION:
size