• Sparrow
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    Thanks Fredito b - very kind of you :)
    August 30, 2017, 6:36 pm
  • fredito b
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    Thanks to you, Sparrow. Your serie gave me the idea.
    August 31, 2017, 6:47 am
  • mystifier
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    Some speculation for speed but couldn't say for sure whether it is logical.
    July 20, 2019, 11:38 am
  • zantedeschia
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    Tricky, but solvable using some temporaries. :)
    May 20, 2020, 12:01 am