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  1. or download this
    sub start_process{
        my $count = 0;
    ...
            $count ++;
        }
    }
    
  2. or download this
    sub start_process{
        my $count = 0;
    ...
            $count ++;
        }
    }
    
  3. or download this
    my $b_started = 0;
    
  4. or download this
    sub start_process{
        $b_started++ and return;
    ...
        }
        $b_started = 0;
    }