valerybokov commented on PR #107:
URL: https://github.com/apache/pdfbox/pull/107#issuecomment-1186575091

   > 
   Heh! I believe, the De Morgan's law works. I tried to interpolate this code 
to a little test. Tell me, please, where is bug?
   
   import java.util.ArrayList;
   public class HelloWorld{
        public static void main(String []args){
           System.out.println(v1() + " "  + v2());
        }
        
        static boolean v1(){
            ArrayList<Integer>list = new ArrayList<Integer>();
      //      list.add(2);
            list.add(4);
        //    list.add(5);
            if (!list.contains(2) && !list.contains(4) && !list.contains(5))
               return false;
               
           return true;
        }
        
        static boolean v2(){
           ArrayList<Integer>list = new ArrayList<Integer>();
       //    list.add(2);
           list.add(4);
        //    list.add(5);
            
            return list.contains(2) || list.contains(4) || list.contains(5);
        }
   }


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