In terms of *coding*, solution B seems to be the most *elegant* and 
straightforward. I suppose it would tackle automatically all possible cases. 
Solution A though, leaves some latitude to the user for tweaking things one 
way or another... Overall, I prefer solution B.

Like Carlo suggested, it seems that you are well-provided for doing this :-)

[I have some - and very ancient (Fortran 77) - experience in coding, so I 
always look at this with interest.]

Thomas

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