st: Keeping values in multiple variables

[djason@email.unc.edu]

I'm having one problem with a command in STATA 8.0. I have variables in which
I want to keep only one case in all of them, but there's too many (204)to do
one by one.

i.e.
keep if mon*=="3"
keep if mon[i]=="3"

But I get an "mon ambiguous abbreviation" error. Please help!!!

Thanks
Dexter E. Jason
*
*   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/