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 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'

Ex Output:
be birthstone of

Ex Input:
Sentence: 'Adobe and the Adobe logo are either registered trademarks or trademarks of the Adobe System Incorporated in the United States and/or other countries .', Argument/Subject 1: 'adobe', Argument/Subject 2: 'adobe system'

Ex Output:
be trademark of

Ex Input:
Sentence: 'April 16 Pol Pot , yet enigmatic Khmer Rouge leader was dead .', Argument/Subject 1: 'pol pot', Argument/Subject 2: 'khmer rouge'

Ex Output:
be leader of