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2019-01-08 19:56 Arno  
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this could have been a  trischi -ultra-cave! :-)

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2019-01-09 18:55 Arno  
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solution free now!   
  
after my cave 'butterfly teamwork' i was curious if a similar effect exists for fireflies. i discovered that a firefly quartet moving downwards can be turned into a triple of fireflies dancing to the right, leaving one firefly behind. so every firefly is needed in this cave! :-)