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: 'I was editor of Surfer magazine , and Richard Nixon was president of the United States .', Argument/Subject 1: 'nixon', Argument/Subject 2: 'unite state'

Ex Output:
be president of

Ex Input:
Sentence: 'The AUFD is managed by an elected International Board of Trustees and Council members .', Argument/Subject 1: 'trustee', Argument/Subject 2: 'board'

Ex Output:
be elect by

Ex Input:
Sentence: 'Uzbekistan is the most populous country in Central Asia with 25 million people and has been the main target of regional militant Islamic groups .', Argument/Subject 1: 'uzbekistan', Argument/Subject 2: 'central asia'

Ex Output:
be country of