instruction:
Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
question:
Sentence: 'Frankfurt and Munich are the biggest airports in Germany .', Argument/Subject 1: 'frankfurt', Argument/Subject 2: 'germany'
answer:
be airport in


question:
Sentence: 'Engineers continued to review photographs of the affected area to determine whether it could pose a problem when Atlantis returns to Earth .', Argument/Subject 1: 'atlanti', Argument/Subject 2: 'earth'
answer:
return to


question:
Sentence: 'Roger Federer won his fifth straight US Open against Scotland 's Andy Murray , who slayed Roger 's dragon , Rafael Nadal , the day before .', Argument/Subject 1: 'federer', Argument/Subject 2: 'us open'
answer:

win