Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.

Input: Consider Input: Relationship: 'be head of', Argument/Subject 1: 'president', Argument/Subject 2: 'executive'

Output: The service has been dubbed Derivatives Collateral Net and automatically aggregates and nets the overall collateral obligations of its participants , explains Art Certosimo , executive vice president and head of Broker-Dealer Services at the bank .

Input: Consider Input: Relationship: 'lead', Argument/Subject 1: 'clinton', Argument/Subject 2: 'mccain'

Output: Clinton led McCain by 29 points in March , 61 % to 32 % .

Input: Consider Input: Relationship: 'win', Argument/Subject 1: 'democrat', Argument/Subject 2: 'congress'
Output: Gay rights supporters were heartened when Democrats won control of Congress last fall .