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.

Sentence: 'President elect Barack Obama has promised to create a new American Opportunity Tax Credit worth $ 4,000 in exchange for 100 hours of community service , according to the Obama-Biden Web site .', Argument/Subject 1: 'president', Argument/Subject 2: 'obama'
elect

Sentence: 'Quickly batch converts audio files between audio formats like MP3 , WAV , WMA , OGG.', Argument/Subject 1: 'audio', Argument/Subject 2: 'mp3'
file to

Sentence: '1804 - The Jeffersonian Republican-controlled United States SenateThe United States Senate is the upper house of the United States Congress , smaller than the U. House of Representatives .', Argument/Subject 1: 'unite state senate', Argument/Subject 2: 'unite state congress'

be house of