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.

[Q]: Sentence: 'The Web Pen Blog is proudly powered by WordPress .', Argument/Subject 1: 'blog', Argument/Subject 2: 'wordpress'
[A]: be power by


[Q]: Sentence: 'Emerald is the birthstone for May and is known for being the 20th and 35th wedding anniversary gemstone .', Argument/Subject 1: 'emerald', Argument/Subject 2: 'may'
[A]: be birthstone of


[Q]: Sentence: 'Ron Paul ran as Libertarian for President , but is now a Republican Congressman .', Argument/Subject 1: 'paul', Argument/Subject 2: 'president'
[A]:
run for