{'biological desert': [0, 0, 0, 1], 'rivers': [3, 2, 8, 8], 'pollutants': [1, 0, 0, 2], 'periyar': [1, 0, 0, 0], 'yamuna': [9, 2, 3, 4], 'mahanadi': [18, 2, 10, 16]}