The digital time H : M : S is defined with three two-digit fields as h2h1 : m2m1 : s2s1, identified with appropriate restricted place values on the hour (H), minute (M) and second (S) fields, is shown to be an 86,400-element cyclic time group, TG. A palindromic sequence of 119-elements and its sub-sequences are consequences of this group TG.
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A.M.S. subject classiﬁcation