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.

Input: Consider 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'

Output: be chairman of

Input: Consider Input: Sentence: 'October birthstone , Pink Tourmaline set in 14K yellow frame with 14K rose , 14K white and 18K yellow gold .', Argument/Subject 1: 'tourmaline', Argument/Subject 2: 'october'

Output: be birthstone of

Input: Consider Input: Sentence: 'Paper presented at the American Economic Association Annual Meeting and at Kennedy School/CESifo Conference on the Economics of Education , Munich , Germany .', Argument/Subject 1: 'paper', Argument/Subject 2: 'conference'
Output: present to