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: 'The Executive Committee of the Board of Directors of BUSC consists of elected members serving 2-year terms .', Argument/Subject 1: 'board', Argument/Subject 2: 'executive committee'
consist of

Sentence: 'Nazi Germany 's attack on the Soviet Union in June 1941 extended the zone of killing operations even farther east .', Argument/Subject 1: 'germany', Argument/Subject 2: 'soviet union'
attack

Sentence: 'And if Richardson endorses Obama , does Joe Biden then come out for Hillary ?', Argument/Subject 1: 'richardson', Argument/Subject 2: 'obama'

endorse