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2020-10-05 17:01 Arno  
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very nice! :-)

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2020-10-05 19:05 nesdori  
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indeed! i wonder if there's just one solution; i didn't check that carefully.

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2020-10-05 21:24 dustin  
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thanks! :D  nesdori , me too! :D

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2020-10-06 11:21 Arno  
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mine is free! :-D

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2020-10-06 11:57 DarkStoorM  
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So we all got the same solution :D I'm also wondering if there are other solutions

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2020-10-06 19:34 dustin  
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yep, mine is identic, too :D  
at first i wanted to make a systematic paperwork about how 4 boulders can be timed, but up to now i lacked motivation. maybe, if i find a crazy idea, there might be a second part :D