The problem:

In Java, I have an interface *IInferrable* which is basically  boolean 
eval();

Any Java object which extends IInferrable, no matter what it is, will 
answer to eval() and return a boolean.
The idea lies at the heart of an inference engine.

But, I also define a class *AndList* which implements IInferrable and 
extends java.util.ArrayList<Inferrable>

So, AndList, and its sibling OrList behave just like a List object, but 
also will answer to eval() by running the collection and dealing with what 
each element returns when it, too, is eval()'d.

I'd really love to discover how to pull that off in Clojure.

Many thanks in advance. -Jack

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