Firstly, I would like to thank Steven for reminding me of the assert
statement. I should have remembered this. It allowed me to isolate the
problem, which predictably (for me) was very elementary. I am too
embarrassed to say how simple the error was.
However, my original problem was not solved by correcting this error.
So, I will now try and narrow down the location of the problem and then
if I cannot solve it, I shall return for more good advice.
Many thanks to Steven and to Peter.
Sydney
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