If this is your input, you output all four records instead of just the first and last. 

A1, B1, C1, first record
A1, B2, C1, second record
A1, B1, C2, third record
A2, B2, C2, fourth record

[download]

I think you may be right about the travelling salesman problem, though. I thought I had a pretty good way to go in my earlier notes, but now I'm not so sure. Maybe Kraythorne will come back with an implementation and tell us.

In reply to Re^2: Most efficient record selection method? by kyle
in thread Most efficient record selection method? by Kraythorne

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