text: 
  var pubnub = require("../pubnub.js").init({
      publish_key   : "demo",
      subscribe_key : "demo"
  });
  
  function log(r) {
  	console.log(JSON.stringify(r));
  }
  
  pubnub.subscribe({
  	channel : ['b', 'c', 'd', 'e'],
  	channel_group : ["gb", "gc", "gd", "ge"],
  	callback : log,
  	error : log,
  	connect : log
  });
  
  setTimeout(function(){
  	pubnub.unsubscribe({channel : ['c','e'], channel_group: ["gb", "ge"], callback : log})
  },8000)