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I have a file containing about 2 million lines of this type: 204/23-1 3878.88 97 204/23-1 3879.03 97 204/23-1 3879.18 97 204/23-1 3879.33 97 204/23-1 3879.48 97 204/23-1 3879.63 97 204/23-1 3879.78 97 204/23-1 3879.93 97 204/24-1A 0458.63 0 204/24-1A 0458.78 0 204/24-1A 0458.93 0 204/24-1A 0459.08 0...