Which underlying form does the book give for أَنَاةٌ?

Miscellaneous Morphological Explanations: Eight Rules for Wāw, Yāʾ, Alif and Hamzah

• أُجُوهٌ
• مِفْتَاحٌ
• وَنَاةٌ
• أَوَاوِلُ