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2019-06-16 14:06 Donald  
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congratulations  Piter ! This is supposed to be very hard but you did it :)

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2019-06-16 14:34 Piter  
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thank you :-) indeed it is very hard, but accidentally i have found the method :-) With a little bit of luck and few tries i did it.  
  
in a while i will uncover my solution, just not to spoil fun for the others now.

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2019-06-17 22:36 Piter  
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demo is free

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2019-06-18 15:40 Donald  
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 nicol 's method is safer but yours is faster,  Piter .  
In theory it should be possible to do it even faster by going immediately between the first small gap of fireflies but that method is almost imossible to execute properly. I tried and got close but I couldn't do it that way.

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2019-06-18 19:16 Piter  
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i've started solving with method you mention,  Donald . with this speed of cave i think it is almost impossible. almost, because i think it can be done this way.