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In binary notation, the powers of two are particularly pleasing, because they all begin with a one followed by increasing quantities of zeros: 2 = 10, 4 = 100, 8 = 1000, 16 = 10000, 32 = 100000.

Of the author's nine additions by the usual figures, four were wrong in one figure each; of his thirty-two additions by different forms of binary notation, five were wrong, one of them in two places.

With four of the observers the binary notation required nearly double the time.