st: how to create more than 2-way interaction terms in xi: regressions?

[Dan Waldo <dwaldo@aresearch.com>]

Dear all,

I see that one can create interaction terms in regressions by typing, 
for example,
xi: regress income i.age*i.sex

suppose that I wish to interact age and sex with race, though ... Stata 
appears to reject
xi: regress income i.age*i.sex*i.race

Is there a way to do this without creating 3 2-way interaction terms? Or 
without creating a separate variable that distinguishes people by age, 
sex, and race?

Thanks!
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/