$sample = [ { X => 'str1',  Y => 'str2',   position => 1 }, 
              X => 'str3',  Y => 'str4',   position => 2 },
              X => 'str5',  Y => 'str6',   position => 3 },
              X => 'str7',  Y => 'str8',   position => 4 },
              X => 'str9',  Y => 'str10',  position => 5 } ];