Just as the airlines hope that their passengers will never have to follow the instructions they give you on what to do in case of a disaster, so we, for our part, hope you may never have to follow the advice we have given you in the preceding pages. But time is running short. We would be deceiving you if we pretended that the nightmare we have described is not a real and deadly possibility. If it does come about, we have one last piece of advice:

BURN THIS BOOK.

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