concept: arranging all the real numbers in a countably infinite manner by counting them as follows: 1, 2
1.1, 1.2, 1.3, [...] 2.7, 2.8, 2.9, 3
1.01, 1.02, 1.03 [...] 3.97, 3.98, 3.99, 4
1.001, 1.002, 1.003, [...] 4.997, 4.998, 4.999, 5
1.0001, 1.0002, 1.0003, [...] 5.9997, 5.9998, 5.9999, 6


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