Detailed Instructions: 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.
Problem:Sentence: 'The heaviest fighting began in September , when a newly created Islamist group , the Jund al-Islam , seized control of some villages near the Iranian border and attempted to institute a strictly Islamic theocratic regime .', Argument/Subject 1: 'group', Argument/Subject 2: 'september'
Solution:
begin in