Uninstalling ports from leaf back to branch

[Sam Kuper]

Dear all,

Suppose I install two ports, CC and DD. Suppose also that CC depends only on
AA and on BB, and that DD depends only on AA.

Is there a way to uninstall CC such that BB automatically gets uninstalled
too, but AA is left intact because it is depended upon by DD?

Many thanks in advance,

Sam
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