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: 'Paper presented at National Conference on Peacemaking and Conflict Resolution , Pittsburgh .', Argument/Subject 1: 'paper', Argument/Subject 2: 'national conference'

Output: present at


Input: Consider Input: Sentence: 'Buy genuine and authentic Viagra manufactured by Pfizer .', Argument/Subject 1: 'viagra', Argument/Subject 2: 'pfizer'


Output: manufacture by