In a large bowl, combine beans, corn and tomatoes. In a small bowl, stir together ricotta, sour cream, and cumin. Place t2 tortillas on the bottom of prepared loaf pan. Spread about 1/3 cup ricotta mixture over tortillas. Top with about 1/2 cup black bean mixture. Sprinkle with 1/4 cup cheese. Repeat procedure 3 times.
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