AnAutogramis a self-referential statement, that lists the frequencies of its own letters and symbols. Here are two examples:
This Autogram contains fifty-three spaces, twenty-four commas, five hyphens, seven As, four Cs, three Ds, thirty-seven Es, fifteen Fs, four Gs, twelve Hs, sixteen Is, two Ls, four Ms, seventeen Ns, thirteen Os, four Ps, fifteen Rs, thirty-four Ss, twenty-six Ts, eight Us, eight Vs, five Ws, three Xs, seven Ys, and one period.
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Whenever possible, I try to avoid the third, seventh, tenth, eleventh, thirteenth, seventeenth, twenty-first, and twenty-sixth letters of the alphabet.