Now the question is: What happens, if there isn't any position left,
for any sphere to be placed ?

Probably you'll need "emergency-exit", so I use to add a counter, how
often I try to position a sphere ...

--
"Somehow what you suggest is like suggesting to add drills \ jan### [at] lzernet
to cars so you can drill for oil when you run out of fuel.  \
Sure you could do it, but it might not be the most practical >          Jan
solution." [Thorsten Froehlich in p.u.p]                    /        Walzer

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