\section*{Test result}
\begin{itemize}
\item[orig] ABCDEFG tuvwxyz
\item[len] 15
\item[1] A
\item[2] AB
\item[3] ABC
\item[4] ABCD
\item[5] ABCDE
\item[6] ABCDEF
\item[7] ABCDEFG
\item[orig] {AB}CDEFG tuvwx{yz}
\item[len] 15
\item[1] {A}
\item[2] {AB}
\item[3] {AB}C
\item[4] {AB}CD
\item[5] {AB}CDE
\item[6] {AB}CDEF
\item[7] {AB}CDEFG
\item[orig] {{AB}CD}EFG tuv{wx{yz}}
\item[len] 15
\item[1] {{A}}
\item[2] {{AB}}
\item[3] {{AB}C}
\item[4] {{AB}CD}
\item[5] {{AB}CD}E
\item[6] {{AB}CD}EF
\item[7] {{AB}CD}EFG
\item[orig] �������~�������
\item[len] 15
\item[1] �
\item[2] ��
\item[3] ���
\item[4] ����
\item[5] �����
\item[6] ������
\item[7] �������
\item[orig] {{��}��}���~���{��{��}}
\item[len] 15
\item[1] {{�}}
\item[2] {{��}}
\item[3] {{��}�}
\item[4] {{��}��}
\item[5] {{��}��}�
\item[6] {{��}��}��
\item[7] {{��}��}���
\end{itemize}
\endinput
