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: 'Horus was the son of Osiris and Isis .', Argument/Subject 1: 'horus', Argument/Subject 2: 'isis'
be son of

Sentence: 'A favorite target for Campus Watch is the late Edward Said , a Columbia University professor best known for his book " Orientalism , " which denounced the "neo-colonialist " policies of successive U.S. administrations .', Argument/Subject 1: 'edward say', Argument/Subject 2: 'columbium university'
be professor at

Sentence: 'Obama leads McCain 46-41 among likely voters .', Argument/Subject 1: 'mccain', Argument/Subject 2: 'obama'

lead