 Thank you, Mowzer, JS, Shani and Dawn for taking the time and trouble to help me out (again!). Your efforts are greatly appreciated, to put it mildly! As you can see, at least you have brought some success for me. 
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petri
"You are old, father William," the young man said,
"And you hair has become very white;
And yet you incessantly stand on you head -
Do you think, at your age, it is right?"
Lewis Carroll.
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