With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Carbon has an atomic number.
text_B: Civil unrest occurred in Mong Kok , Hong Kong from the night of 8 February 2016 until the next morning .. Mong Kok. Mong Kok. Civil unrest. Civil unrest. Hong Kong. Hong Kong. The incident escalated from the government 's crackdown on unlicensed street hawkers during the Chinese New Year holidays .. hawkers. Hawkers in Hong Kong. street hawkers. Hawkers in Hong Kong. Chinese New Year. Chinese New Year. Eventual violent clashes broke out between police and protesters .. Batons and pepper spray were used by the police and two warning shots were fired into the air , while protesters threw glass bottles , bricks , flower pots and trash bins toward the police and set fires in the streets .. pepper spray. pepper spray. the police. Hong Kong Police. The Hong Kong government has classified the violent incident as a riot , while some media outlets and social media platforms have opted for calling the event `` Fishball Revolution '' , in reference to fishballs , a popular Hong Kong street food .. Hong Kong. Hong Kong. riot. riot. Hong Kong street food. Hong Kong street food. The violence has been described by The Economist as `` the worst outbreak of rioting since the 1960s . ''. The Economist. The Economist. since the 1960s. Hong Kong 1967 Leftist riots
not_related.