[R] order of interaction coeff in lm

[slurpy]

Hi. I haven't found this question asked elsewhere, so I hope I am not missing
something trivial. 

y<-rnorm(1:10)
x1<-rnorm(1:10)
x2<-rnorm(1:10)
x3<-rnorm(1:10)
x4<-rnorm(1:10)
reg<-lm(y~x1*x2+x3+x4)
summary(reg)

The output of this puts x1:x2 after x3 and x4. In my case this is very
cumbersome because I have about 50 dummy variables instead of just x3 and
x4. Is there any way I can get R to print out x1:x2 right after x1 and x2? I
can always do:

x1_x2<-x1*x2
reg<-lm(y~x1+x2+x1_x2+x3+x4)

But I was wondering if there is something more elegant, since I like the
interaction term denoted by a colon.

Thanks.
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R 2.9.2/vista x64
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