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.

Ex Input:
Sentence: 'The Chairman of the US Federal Reserve Bank , Ben Bernanke , rings the forex market bell at a speech he made yesterday at an economic conference in Barcelona Spain .', Argument/Subject 1: 'bernanke', Argument/Subject 2: 'federal reserve'

Ex Output:
be chairman of


Ex Input:
Sentence: 'Obama will crush McCain ...', Argument/Subject 1: 'obama', Argument/Subject 2: 'mccain'

Ex Output:
crush


Ex Input:
Sentence: 'Paper presented at The International Conference on Arabic Linguistics , Dec. 20-22 .', Argument/Subject 1: 'paper', Argument/Subject 2: 'conference'

Ex Output:

present at