function(keys, values, rereduce) {

   
    var ucount = 0;
    var seen = new Object();
    
      if (!rereduce) {
      // This is the reduce phase, we are reducing over emitted values from
      // the map functions.

      // we count 1 if a given uname has not been seen

      for(var i in values) {
          if (seen[values[i][0]] == undefined) {
               seen[values[i][0]] = 1;
               ucount += 1;
          }
      }
     
    }
    else {
      // This is the rereduce phase, we are re-reducing previosuly
      // reduced values.
      for(var i in values) {
          // loop around seen object values
          
          for(var j in values[i][1]) {
              if (seen[j] == undefined) {
                  seen[j] = 1; 
                  ucount += 1;
              }
          }
      }
    }
    return [ucount, seen];
   }