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Some questions and comments:
Are there labels on the connections? If you know what the labels are, the
diagram should use them.
Since sequence is so important, why are you using letters rather than
numbers?
In either case, I prefer that the labels be in the order of the procedure.
This reinforces the message that you cannot just work in a natural sequence.
My $0.02 worth
Jim Shaeffer
Jims -at- spsi -dot- com <mailto:Jims -at- spsi -dot- com>