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.

Sentence: 'Not only for the twin towers fentanyl ZOLPIDEM may cause Restless Leg Syndrome and nighttime grinding of teeth .', Argument/Subject 1: 'zolpidem', Argument/Subject 2: 'restless leg syndrome'
cause

Sentence: 'Obama and his followers should move to Chicago .', Argument/Subject 1: 'obama', Argument/Subject 2: 'chicago'
move to

Sentence: 'Ralph Reed was the former Executive Director for the Christian Coalition .', Argument/Subject 1: 'ralph reed', Argument/Subject 2: 'christian coalition'

be executive director of