Quote:
Firstly, what's a "forula"?
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A typo. It should be:
Formula.
To answer that second question:
It means that I know what to do when something goes wrong.
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'It just shows you how true it is that one-half the world doesn't knows how the other three-quarters lives.'
Bertie, The Code of the Woosters, by P. G. Wodewouse