Detailed Instructions: 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.
Problem:Sentence: 'He has served as President of the Healthcare Materials Managers Association , Director of Materials Management for Pioneer Valley Hospital and COO of Mountain States Medical - a medical supply distributorship .', Argument/Subject 1: 'association', Argument/Subject 2: 'president'
Solution:
have