This sentence has three As, two Cs, two Ds, nineteen Es, six Fs, two Gs, five Hs, ten Is, two Ls, twelve Ns, nine Os, five Rs, twenty six Ss, sixteen Ts, four Us, four Vs, eight Ws, four Xs, and two Ys.
How many other similar self-referential statements can you come up with (there exist a relatively small finite number of possibilities)?
This sentence contains thirty-eight letters.
This sentence contains thirty-six letters.
These are easier to construct, but they fullfil the question.