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.

[EX Q]: Sentence: 'Horus was the son of Osiris and Isis .', Argument/Subject 1: 'horus', Argument/Subject 2: 'isis'
[EX A]: be son of

[EX Q]: Sentence: 'Christchurch , also known as The Garden City is located on the east coast of the South Island of New Zealand .', Argument/Subject 1: 'christchurch', Argument/Subject 2: 'garden city'
[EX A]: be know as

[EX Q]: Sentence: '7. The Principal and Vice-Chancellor of the University is an ex officio member of all standing committees of the Board .', Argument/Subject 1: 'principal', Argument/Subject 2: 'board'
[EX A]:
be member of