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          push(@arrCompletedChains, $strChain);
    
  2. or download this
        If any part of LIST is an array, "foreach" will get very
        confused if you add or remove elements within the loop
        body, for example with "splice".   So don't do that.
    
  3. or download this
    
    use List::Util 'first';
    ...
    
    @arrWorkingCompletedChains = grep !$to_delete{ $_ }, @arrWorkingComple
    +tedChains;