Combine rice and water in a saucepan, and bring to a boil. Reduce heat to low, cover, and simmer for 35 to 40 minutes, or until tender. Remove from heat, and cool.

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Place black beans and pinto beans into a colander or strainer, and rinse.Add corn and diced tomatoes with green chilies, and toss to mix. Transfer to a large bowl, and mix in rice and cheese.

Divide the mixture evenly among the tortillas, and roll up. Wrap individually in plastic wrap, place into a large freezer bag, and freeze. Reheat as needed in the microwave for lunch or snacks.