I want to thank everybody who has who has contributed in a constructive way. In an unrelated thread some things were said that made me realize that what knowledge I gain from this exercise is not likely to be practical knowledge.

That said, it is still a mental exercise and anything which can keep a person's problem solving skills sharp is a good thing.

Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday