> The computations are not that difficult.  For any triangular 
> configuration of resistors there is a Y-shaped configuration that has 
> the same resistance, between any two of the three corners, as the 
> triangular configuration.  Repeated substitution, and combination of 
> resistors in series and parallel, allows the circuit to be simplified.

That's a lot of scope for errors, if you're doing it by hand...

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