To nimda and Clipka:

I got it! :-)

The #for() loop definitely does *not* work correctly for my particular 
case, while the #while() loop does. The reason is that Counter should 
only be incremented *if* the #inside() test is passed as negative (not 
inside object). With the #for() loop, Counter is *always* incremented 
whatever the result of the #inside() test.

Conclusion: I should use the #while() loop in this case as easiest 
coding procedure.

My first question about the different results in placing houses is now 
also answered. It derives from the above of course.

Thomas

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