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Truly a brilliant explanation Harry. I've taken the liberty of quoting a paragraph of it to a friend who didn't understand that he even had a fbh!
Hope you don't mind - I credited you as author - I couldn't have written it so clearly or concisely.
Well done,
Singvogel.
![Xmas Smiley 035](images/smilies/xmas-smiley-035.gif)