hi all, if i select any two two common names, need not to allow user check other same name, or unselect the other if selected other
Ex: If andhrapradesh is selected , again selected as andhrapradesh, need to unselect  the other andhrapradesh. 
please let me know the how can i proceed..
 or a boolean set to false..! 
Visual force page:

<apex:page controller="test3">
   <apex:form >
   <apex:pageBlock >
      <apex:pageblockTable value="{!wraplist}"  var="a">
       <apex:column ><apex:inputCheckbox value="{!a.selected}"/>{!a.name}</apex:column>
       </apex:pageblockTable>
    <apex:commandButton value="OrderSelected"  reRender="one,two" action="{!duplicatecheck}"/>
       <apex:outputLabel id="two">{!listSelectedNames}</apex:outputLabel>
    </apex:pageBlock>
   </apex:form>
</apex:page>

ApexClass:
 

public class test3{
 public list<string>listSelectedNames{get;set;}
 public list<Wrapperclass>wraplist{get;set;}
 public list<Wrapperclass> containslistcheck{get;set;}

  
  public test3(){
 listSelectedNames = new list<string>();
containslistcheck  = new list<Wrapperclass>(); 
 
 wraplist = new list<Wrapperclass>();
   Wrapperclass   wf = new Wrapperclass();
                  wf.selected=false;
                  wf.name ='AndhraPradesh';
                 
    Wrapperclass   wf1 = new Wrapperclass();
                  wf1.selected=false;
                  wf1.name ='Telangana';
                                  
   Wrapperclass   wf2 = new Wrapperclass();
                  wf2.selected=false;
                  wf2.name ='Chennai';
                
     Wrapperclass   wf3= new Wrapperclass();
                  wf3.selected=false;
                  wf3.name ='AndhraPradesh';
                  
                  
     Wrapperclass   wf4= new Wrapperclass();
                  wf4.selected=false;
                  wf4.name ='Karnataka';
                  
                  
     Wrapperclass   wf5 = new Wrapperclass();
                  wf5.selected=false;
                  wf5.name ='Telangana';            
                
          wraplist.add(wf);
          wraplist.add(wf1);
          wraplist.add(wf2);
          wraplist.add(wf3);
          wraplist.add(wf4);
         wraplist.add(wf5);
 }
 
 
   public void duplicatecheck(){
    listSelectedNames.clear();
   
    
    for(wrapperclass wrap: wraplist){
        if(wrap.selected == true){
           
            listSelectedNames.add(wrap.Name);
           
         }  
    }
    
    system.debug(listSelectedNames);
}


 //wrapper classs
    public class Wrapperclass{
       public boolean selected{get;set;}
       public string Name{get;set;}
    }
  
  
}

any suggestions are welcomed.

Thanks 
Soumya sree