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Cake:
4 1/2 dl (scant 2 cups) flour
1 1/2 dl (2/3 cup) sugar
1 tablespoon baking powder
150 g (5 ounces, scant 2/3 cup)
unsalted butter
1 egg
2 dl (3/4 cup) lingonberry preserves
Streusel topping:
1 1/2 dl (2/3 cup) oatmeal
3 tablespoons butter
1 dl (1/2 cup) sugar
1 teaspoon vanilla sugar (1/2 teaspoon extract)
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