sublis

(sublis alist tree &key key test test-not)

Returns a fresh copy of tree in which every subtree matching a key of alist is replaced by that entry's value. Each subtree -- the cons cells as well as the leaves -- is looked up before being descended into, so a whole branch can be substituted. The default test is eql; :key is applied to the subtree before the lookup.

The destructive nsublis is not provided.