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2022-08-16 19:15 dustin  
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showing is easier than explaining. that's what i meant,  darkstoorm  - you need butterflies at the right to avoid the cso problem :)

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2022-08-16 19:23 dustin  
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you can still leave away half of the supporting fflies at the left and bottom side. wait a sec, i'll update the cave...

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2022-08-16 19:26 dustin  
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done! that's the closest to ff20 i can get with fflies! :d

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2022-08-16 20:44 DarkStoorM  
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Ahh! so that's why I couldn't get the flies to go up :D nice!

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2022-08-16 21:29 dustin  
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feel free to clone this and make a nice cave out of it :)

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2022-08-16 22:06 DarkStoorM  
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I think it'd be better to edit this one and make it solvable :D

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2022-08-16 22:15 dustin  
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ok let's see... :d

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2022-08-16 22:29 DarkStoorM  
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Great ;) no caves will go to waste! :D:D

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2022-08-16 22:29 dustin  
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how about this? :d  
  
summary of the previous discussions:  
| this one comes close to being the firefly equivalent of "funny flies 20".  
| however, at the right side, if fireflies were used instead of butterflies, the cavescanning order would make problems and the formation would break.  
| so this is one more example how cso makes bd asymmetric! :d

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2022-08-16 22:44 DarkStoorM  
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I actually really hoped 100% ffly would be possible, so another cave would go like this: you escape the box to grab diamonds and go back inside to the reach the outbox, but sadly, the top is sealed and not sure if going to the left with a small gap is possible, haven't checked it yet though!  
  
I can only imagine what other shapes will eventually be found out! :D

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2022-08-16 23:11 dustin  
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hmm. i think even a simple two-column firefly belt like this...  
  
l.  
..  
..  
.r  
l.  
..  
..  
.r  
l.  
..  
..  
.r  
  
...cannot be passed from right to left (without open border tricks).