The first verse of the Dhammapada (“DUH-muh-puh-duh”) compares this concept to a wheel that follows the ox’s step. A common etymology of this concept compares it to a badly-fitting axle. The three forms of this concept include its vipariṇāma (“vip-puh-rin-NAH-muh”) form “of change” and its sankhāra form “of existence.” This concept is one of the three marks of existence, along with aniccā (“un-NITCH-chah”), or impermanence, and anattā (“un-NUT-tah”), or a lack of unchanging self. This concept is caused by taṇhā (“TUN-hah”), a term for craving or attachment, and the cessation of this concept is called nirodha. After living a sheltered life, (-5[1])Siddhārtha (-5[1])Gautama first learns about this concept after encountering age, disease, and death. For 10 points, name this characteristic of mundane life according to the first of the Four Noble Truths, a sensation (10[1])that can be ended by attaining nirvāṇa. ■END■ (10[1])