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.

Example Input: Sentence: 'Buy V-RX Va herbal alternative to Viagra from the online sex store at SexyFun.co.uk .', Argument/Subject 1: 'viagra', Argument/Subject 2: 'online'
Example Output: buy

Example Input: 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'
Example Output: be birthstone of

Example Input: Sentence: 'Alexandria is Egypt busting port city with more Greek and French flare than the rest of the country .', Argument/Subject 1: 'alexandrium', Argument/Subject 2: 'egypt'
Example Output:
be city of