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 election of Illinois Senator Barack Obama as America 's 44th president is astounding , historical , implausible , improbable and completely without precedent in the history of the United States .', Argument/Subject 1: 'obama', Argument/Subject 2: 'america'

Output: be president of

Input: Consider Input: Sentence: 'In the event of the absence of the Treasurer , the Assistant Treasurer shall assume the duties of the Treasurer .', Argument/Subject 1: 'assistant treasurer', Argument/Subject 2: 'treasurer'

Output: assume duty of

Input: Consider Input: Sentence: 'India Blog is powered by WordPress 2.3.3 and delivered to you in 1.683 seconds using 21 queries .', Argument/Subject 1: 'blog', Argument/Subject 2: 'wordpress'
Output: power by