Here is a list of the top 5 cereal-producing countries for five different types of cereal:

1. Wheat:
- China
- India
- Russia
- United States
- Canada
2. Rice:
- China
- India
- Indonesia
- Bangladesh
- Vietnam
3. Corn:
- United States
- China
- Brazil
- Argentina
- Mexico
4. Barley:
- Russia
- Germany
- Canada
- France
- Ukraine
5.  Oats:
- Russia
- Canada
- Australia
- Poland
- Finland

Note that these rankings may vary depending on the year and source of data.
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