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: 'XHTML is a modified version of HTML that is fully XML compatible , so that it can be processed by XML parsers .', Argument/Subject 1: 'xhtml', Argument/Subject 2: 'html'
Example Output: be version of

Example Input: Sentence: 'XHTML provides the framework for future extensions of HTML and aims to replace HTML in the future .', Argument/Subject 1: 'html', Argument/Subject 2: 'xhtml'
Example Output: be replace by

Example Input: Sentence: 'Its range spans from Newfoundland south to Maryland and as far west as the Yukon territories in Canada .', Argument/Subject 1: 'yukon', Argument/Subject 2: 'canada'
Example Output:
be territory of