{'iron ore mining areas': [0, 0, 0, 1], 'ground water': [3, 0, 0, 5], 'arsenic': [1, 0, 2, 3], 'elements': [0, 0, 2, 5], 'nitrate': [0, 0, 1, 4], 'calcium': [2, 0, 0, 4], 'fluoride': [1, 0, 0, 1], 'vicinity': [0, 1, 0, 1]}