TASK DEFINITION: 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: 'The Ukrainian language is the only official language in Ukraine , while Russian is also widely spoken and is known to most Ukrainians as a second language .', Argument/Subject 1: 'ukrainian', Argument/Subject 2: 'ukraine'

SOLUTION: be language in

PROBLEM: Sentence: 'Washington , D.C. , January 27 , 2009 The Inter-American Commission on Human Rights expresses its deep satisfaction over the decision by the President of the United States , Barack Obama , to close the detention center at the Guantamo Bay Naval Base within a period of no later than one year and to prohibit cruel , inhuman , or degrading treatment in interrogations of detained individuals .', Argument/Subject 1: 'barack obama', Argument/Subject 2: 'unite state'

SOLUTION: be president of

PROBLEM: Sentence: 'Harbin , capital of Northeast China 's Heilongjiang Province , recommends cream yellow and white to be the colours of its architecture .', Argument/Subject 1: 'harbin', Argument/Subject 2: 'heilongjiang'

SOLUTION:
be capital of