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1 (6 ounce) can water-packed tuna, drained and flaked
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2/3 cup chopped seeded peeled cucumber
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1/2 cup shredded carrot
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1/4 cup finely chopped green onions
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1/4 cup fat-free mayonnaise
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1/4 cup Dijon mustard
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2 tablespoons fat-free sour cream
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1 tablespoon lemon juice
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pepper to taste
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8 slices whole wheat bread
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4 lettuce leaves
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