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For the curve given by find the unit normal vector.
Concentric Circles
A model or pattern consisting of circles sharing the same center, expanding outwardly from a common central point.
Western Sudan
A geographical region of Sudan, often associated with Darfur, known for its complex social, political, and environmental challenges including conflict and displacement.
Famine
A severe shortage of food leading to widespread hunger, malnutrition, and mortality.
Sanitary Needs
Essential requirements for maintaining health and cleanliness, including access to clean water and proper waste disposal facilities.
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