9.29 The letters of the Morse alphabet consist of symbols (dots and dashes). How many letters can be represented if we require that each letter contain no more than five symbols?
9.29 Letters containing exactly $k$ characters are $2^{k}$; therefore, in total, we can represent

$2^{1}+2^{2}+2^{3}+\ldots+2^{5}=\frac{2\left(2^{5}-1\right)}{2-1}=62$ letters.

Answer: 62 letters.