[gentoo-amd64] unmerging slotted group packages

[Daiajo Tibdixious]

I discovered by accident that I have KDE 3.3, 3.4, & 3.5 all installed
at the same time.
I wanted to clean out 3.3 (at least) and tried emerge -aC
=kde-base/kde-3.3.0 which of course just did this pseudo package, not
the containing packages.
I also tried emerge --clean kde-base/kde but this says nothing to
remove, even though 3.4 & 3.5 are still present:
[D] kde-base/kde
     Available versions:  (3.5)  3.5.2 3.5.5
     Installed:           3.4.3(3.4)(17:19:35 01/18/06)(-accessibility)
                          3.5.5(3.5)(02:50:53 12/10/06)(-accessibility)
     Homepage:            http://www.kde.org/
     Description:         KDE - merge this to pull in all
non-developer kde-base/* packages

I got rid of 3.3 by doing eix -I kde & removing each sub-package
manually, I just think I must be missing an easier way.
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