Recognition of "sub" and "unsub"

[Software Development <junkyard @ primate . wisc . edu>]

I notice that majordomo recognizes "subscribe" and "unsubscribe" but
not "sub" or "unsub".  On the other hand, the administrivia checks
done by resend recognize all four.

Is there a reason not to recognize "sub" and "unsub" in majordomo?

Paul DuBois
dubois@primate.wisc.edu