<P> Under the recommendation of the Sixth Central Pay Commission, the CCA classification was abolished in 2008 . The earlier HRA classification of cities was changed from A-1 to X; A, B - 1, and B - 2 to Y; and C and unclassified cities to Z . X, Y, and Z are more commonly known as Tier - 1, Tier - 2, and Tier - 3 cities, respectively . </P> <P> On the basis of the 2011 census, two cities--Pune and Ahmedabad--were upgraded from Y to X and 21 cities from Z to Y on 1 April 2014 . </P> <Table> <Tr> <Th> HRA classification </Th> <Th> City </Th> </Tr> <Tr> <Td> X </Td> <Td> Ahmedabad, Bangalore, Chennai, Delhi, Hyderabad, Kolkata, Mumbai, Pune </Td> </Tr> <Tr> <Td> Y </Td> <Td> <P> Agra, Ajmer, Aligarh, Allahabad, Amravati, Amritsar, Asansol, Aurangabad, Bareilly, Belgaum, Bhavnagar, Bhiwandi, Bhopal, Bhubaneswar, Bikaner, Bokaro Steel City, Chandigarh, Coimbatore, Cuttack, Dehradun, Dhanbad, Durg - Bhilai Nagar, Durgapur, Erode, Faridabad, Firozabad, Ghaziabad, Gorakhpur, Gulbarga, Guntur, Gurgaon, Guwahati ‚ Gwalior, Hubli - Dharwad, Indore, Jabalpur, Jaipur, Jalandhar, Jammu, Jamnagar, Jamshedpur, Jhansi, Jodhpur, Kannur, Kanpur, Kakinada, Kochi, Kottayam, Kolhapur, Kollam, Kota, Kozhikode, Kurnool, Lucknow, Ludhiana, Madurai, Malappuram, Mathura, Goa, Mangalore, Meerut, Moradabad, Mysore, Nagpur, Nanded, Nashik, Nellore, Noida, Palakkad, Patna, Pondicherry, Raipur, Rajkot, Rajahmundry, Ranchi, Rourkela, Salem, Sangli, Siliguri, Solapur, Srinagar, Sultanpur, Surat, Thiruvananthapuram, Thrissur, Tiruchirappalli, Tirunelveli, Tiruppur, Ujjain, Bijapur, Vadodara, Varanasi, Vasai - Virar City, Vijayawada, Visakhapatnam, Warangal </P> </Td> </Tr> <Tr> <Td> Z </Td> <Td> All other cities </Td> </Tr> </Table> <Tr> <Th> HRA classification </Th> <Th> City </Th> </Tr>

List of x and y class cities in india
find me the text answering this question