Possible Clues:

• "I ___ differ"
• 'I ___ differ'
• ___ differ (object)
• "I — differ!"
• "I __ differ"
• 'I __ differ'
• 'Ain't Too Proud, ___ Differ' (Temptations hit)
• ___ disagree (object)
• 'I -- differ!'
• 'I ___ differ!'