This example is taken from Software Engineering course notes by Prof. W. B. Joerg.

Read the example as follows:

1. If Payment > 0 and Owing > 0, send a bill and a receipt, but no flyer.
2. If Payment > 0 and Owing <= 0, send a receipt and a flyer, but no bill.
3. If Payment <= 0 and Owing > 0, just send a bill.
4. If Payment <= 0 and Owing <= 0, just send a flyer.

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