1 and 2 mean exactly the same thing. The words "can" and "are able" mean the same thing.
The word "may," however, means you have permission to do whatever the action is. So 3 and 4 mean the same thing as each other.
1. You can read whatever magazine you like.
2. You are able to read whatever magazine you like.
3. You may read whatever magazine you like.
4. You are allowed to read whatever magazine you like.
(Does #1 mean #2 or #3?)
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