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.
Input: Sentence: 'Unexcused absences An excused absence is when a Board member notifies the Chairman of the Board of Directors prior to the meeting of his/her inability to attend ( for valid reasons , I.e .', Argument/Subject 1: 'chairman', Argument/Subject 2: 'board'
Output:
be member of