From the graph we know that:
• 2 friends have 0 or 1 pets
• 4 friends have 2 or 3 pets
• 9 friends have 4 or 5 pets
• 6 friends have 6 or 7 pets
Then, 9 - 4 = 5 friends more have 4 or 5 pets than have 2 or 3 pets
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