{'wireless communication': [0, 0, 0, 1], 'troposphere': [6, 1, 1, 1], 'ionosphere': [1, 0, 0, 0], 'exosphere': [3, 0, 3, 4], 'stratosphere': [1, 0, 1, 0], 'earth': [0, 1, 1, 1], 'surface': [1, 0, 0, 0]}