Hashing of "switch/case" selections

[Dave Korn]

> unique hashes are not even desirable, note that in particular the
> original input meets the definition of a unique hash. I don't find
> the concept at all useful in this context.

  I think Mr. Huffman and Mr. Kern might disagree..... surely a
.ZIP file is a unique hash of a given input, and one that has a 
very useful difference from that original input.  Of course, IANAQCS.

             DaveK