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Preheat oven to 350 deg. F.
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Lightly spoon flour into dry measuring cups; level with a knife.
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Combine flour, aniseed, baking soda, and salt, stirring with a whisk.
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Place sugar and butter in a large bowl; beat at medium speed with a mixer until blended (about 2 minutes).
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Add eggs, one at a time, beating well after each addition.
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Add flour mixture to sugar mixture, beating until just blended.
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Turn dough out onto a lightly floured surface, and knead 7 times.
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Shape the dough into a 12" long roll.
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Place roll on a baking sheet coated with cooking spray; pat to 1" thickness.
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Bake for 40 minutes.
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Remove roll from baking sheet; cool 10 minutes on a wire rack.
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Reduce oven to 300 deg. F.
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Cut roll crosswise into 22 slices.
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Place cut side down, on baking sheet.
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Bake for 10 minutes.
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Turn cookies over and bake an additional 10 minutes (cookies will be slightly soft in center but will harden as they cool).
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Cool cookies completely on wire rack.
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Heat chocolate in a small heavy saucepan over low heat for 5 minutes or until melted; stir.
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Dip cookies, top sides down, in chocolate; allow excess chocolate to drip back into pan.
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Place cookies, chocolate sides up, on a baking sheet.
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Let stand 1 hour or until set.