Clive and Alvin asked their friends how many books they had read in the past month.
Clive draws a picture graph to show the results for his friends.
Alvin draws a column graph to show the results for his friends.
How many more of Clive's friends read 3-4 books in the last month than Alvin's friends?
`0` | `4` | `6` | `8` |
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