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.

Input: Consider Input: Sentence: 'The African Union is a successor to the Organization of African Unity .', Argument/Subject 1: 'african union', Argument/Subject 2: 'organization of african unity'

Output: be successor to


Input: Consider Input: Sentence: 'Chittagong is the second-largest city in Bangladesh and is a major port .', Argument/Subject 1: 'chittagong', Argument/Subject 2: 'bangladesh'

Output: be city in


Input: Consider Input: Sentence: 'Amethyst is the February birthstone , so the ring pictured here would make an excellent birthday gift .', Argument/Subject 1: 'amethyst', Argument/Subject 2: 'february'


Output: be birthstone of