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The headings of the columns are “Binary”, Character”, “Binary”, “Character”. The first column contains the binary numbers 0100 0001 to 0100 1010 (inclusive). In each case the third binary digit (which is always a 0) is in blue. The second column contains the upper case characters A to J (inclusive). The third column contains the binary numbers 0110 0001 to 0110 1010 (inclusive). In each case the third binary digit (which is always a 1) is in blue. The sixth column contains the lower case characters a to j (inclusive).