Commit 3fda2926 authored by Alvin Cheung's avatar Alvin Cheung
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each country can be crossed by zero or several rivers -> each country can be...

each country can be crossed by zero or several rivers -> each country can be crossed by zero or more rivers
parent b05b2940
......@@ -39,7 +39,7 @@ Textbook chapter 3.1-3.4, 4.1-4.6
**Relationships:**
- each city belongs to exactly one country
- each river crosses one or several countries
- each country can be crossed by zero or several rivers
- each country can be crossed by zero or more rivers
- each river ends in either a river or in a sea
You can draw your diagrams on paper and scan them, take *quality* pictures of your drawn diagram, or use your favorite drawing tool such as Powerpoint, Keynote, or [draw.io](https://www.draw.io/). (FYI: Google Slides lacks a few shapes that you might need such as rounded arrows.)
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