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- is -- Operation (predicate), two inputs.
- The inputs can be any Logo objects. The output is the word true if
- the two inputs are identical. That is, they must be of the same type
- (both words or both lists), they must have the same count, and their
- members (if lists) or their characters (if words) must be identical.
- The output is the word false otherwise. (Note: this is an exception
- to the convention that names of predicates end with the letter "p".)
-