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Extend and include relationships

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I require assistance in describing in my own terms the difference between the extend and include relationships with an example.

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The difference between the extend and include relationships with an exam are provided.

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Extends Relationship
=============

In Extends Relationship one use case extends another use case by adding actions to a general use case. One use case is a source use case and another a target use case, and the target use case extends the behaviour of the source use case.

__________________
| |
/| Lend Book |
O / | |
---- / -------------------------
| / ^
/ |
Library | extends
assistant _______|_________
| |
| Lend special item |
| |
-------------------------

Figure 1. Use cases ...

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