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From kingofmycastle@gmx.net:
What does he define as a fortress?

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From jaimevives@mixmail.com:
A bit macabre idea, but on topic. :)

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From a.vandekraats@student.utwente.nl:
Interesting concept. The atmosphere and the graveyard are very well-matched.

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From delfeld@mailcity.com:
At first, I thought your relation to the theme was ephemeral.  I am glad you
explained well in the text file!  

I did not mind the use of real people's names, though I do not think there is a
double entendre to the Challenger astronaut's admission.