It runs MS-DOS 6.2 (U.S. version).should be
It runs MS-DOS 6.22 (U.S. version).
An item is ... a character string ...should be
An item is ... a non-empty character string ...
should be+-----------------+----------------+ | Standard Output | Standard Input | +-----------------+----------------+ _________________|4 | |C 1 1 |1 | |C 1 2 |2 | |C 2 3 |2 | |C 1 3 |1 | |L 3 1 2 +----------------+ +-----------------+
That is, the first input item should be 3 instead of 4.+-----------------+----------------+ | Standard Output | Standard Input | +-----------------+----------------+ _________________|3 | |C 1 1 |1 | |C 1 2 |2 | |C 2 3 |2 | |C 1 3 |1 | |L 3 1 2 +----------------+ +-----------------+