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.
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Question: Given Relationship: 'invade', Sentence: 'He referred to the USA invading Iraq without cause and nothing being done about it .'

Answer: invading

Question: Given Relationship: 'open', Sentence: 'Registration will open on February 1st , 2009 at 00:01 MA time and will close on February 10th , 2009 at 23 :59 MA time .'

Answer: open

Question: Given Relationship: 'be version of', Sentence: 'Our literature search used the PubMed version of Medline on the internet .'

Answer:
version