* Command not starting in first column
 ? 0
* Verify that errors are correctly reported for each
* command by testing # of arguments, invalid commands,
* and invalid vector specifications.
*
* Assignment
=
= 0
= -1
= 3
= x
= 3 1 1 1
= 0 x 1
* 
* Fetch
*
?
? 0
? 0 1 1
*
* Status
*
s
s 0 1
*
* Other commands should be ignored
*
x
1