@prefix : <#> .
     @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
    
      ( "only"  )
         :append  (
        () 
        "only"  ) .
      ( 1 
        2  )
         :append  (
         (
            1  )
        2  ) .
      ( 2  )
         :append  (
        () 
        2  ) .
    
    :A0     :RESULT  (
        "only"  ) .
    
    :A1     :RESULT  (
        1 
        2  ) .
    
    :B0     :append  (
        () 
        "onlyB"  );
         rdf:first "onlyB";
         rdf:rest () .