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** [https://world.openfoodfacts.org/category/blanched-shelled-hazelnuts Blanched shelled hazelnuts] and [https://world.openfoodfacts.org/category/shelled-hazelnuts-with-skin Shelled hazelnuts with skin] should not be assigned simultaneously;
** [https://world.openfoodfacts.org/category/blanched-shelled-hazelnuts Blanched shelled hazelnuts] and [https://world.openfoodfacts.org/category/shelled-hazelnuts-with-skin Shelled hazelnuts with skin] should not be assigned simultaneously;
** [https://world.openfoodfacts.org/category/raw-hazelnuts Raw hazelnuts] and [https://world.openfoodfacts.org/category/roasted-hazelnuts Roasted hazelnuts] should not be assigned simultaneously;
** [https://world.openfoodfacts.org/category/raw-hazelnuts Raw hazelnuts] and [https://world.openfoodfacts.org/category/roasted-hazelnuts Roasted hazelnuts] should not be assigned simultaneously;
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* Oneside opposites:
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These are categories which are incompatible and which are often due to adding an ingredient as a category:
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** [https://world.openfoodfacts.org/category/sweet-spreads Sweet spreads] - to suppress chocolate-hazelnut creams;
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** [https://world.openfoodfacts.org/category/almonds Almonds] - to suppress mixed nuts;
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** [https://world.openfoodfacts.org/category/walnuts Walnuts] - to suppress mixed nuts;
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** [https://world.openfoodfacts.org/category/snacks Snacks] - to suppress bars with hazelnut;
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** [https://world.openfoodfacts.org/category/dried-fruits Dried fruits] - to mixes with dried fruits, such as raisins;
=== Nutritional errors ===
=== Nutritional errors ===