st: how to create all possible combinations for the observations of 1-variable data

[sarah smith <sarah22209@gmail.com>]

Dear Stata users;

I have a 1-variable Stata file like:
var1
A
B
C
and I would like to create all possible combinations of observations as below:
var1 var2
A     A
A     B
A     C
B     A
B     B
B     C
C     A
C     B
C     C
I would appreciate if you can help me how to create above file.
Thank you very much,
Sarah
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/