old_contents: 
  /**
   * Module dependencies.
   */
  
  var express = require('express');
  var routes = require('./routes');
  var user = require('./routes/user');
  var http = require('http');
  var path = require('path');
  
  var app = express();
  
  // Models
  var LSystem = require('./models/lsystem');
  var RuleParser = require('./models/rule_parser');
  
  // all environments
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
  
  // development only
  if ('development' == app.get('env')) {
    app.use(express.errorHandler());
  }
  
  app.get('/', routes.index);
  app.get('/users', user.list);
  
  app.post('/new_lsystem', function(req, res) {
    var rp = new RuleParser(req.body.rules);
    var alphabet = req.body.alphabet.split(', ');
    var angle = parseFloat(req.body.angle);
    var rules = rp.parse();
    var lsys = new LSystem(alphabet, req.body.axiom, rules);
    lsys.set_angle(angle);
    console.log('[DEBUG] alphabet = ' + JSON.stringify(alphabet));
    console.log('[DEBUG] axiom = ' + req.body.axiom);
    console.log('[DEBUG] lsys = ' + JSON.stringify(lsys));
    lsys.generate(req.body.iterations);
    console.log('[DEBUG] lsys = ' + JSON.stringify(lsys));
    res.render('lsys', {lsys_str: lsys.str, title: 'L-System Drawing'});
  });
  
  http.createServer(app).listen(app.get('port'), function(){
    console.log('Express server listening on port ' + app.get('port'));
  });
  
new_contents: 
  /**
   * Module dependencies.
   */
  
  var express = require('express');
  var routes = require('./routes');
  var user = require('./routes/user');
  var http = require('http');
  var path = require('path');
  
  var app = express();
  
  // Models
  var LSystem = require('./models/lsystem');
  var RuleParser = require('./models/rule_parser');
  
  // all environments
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
  
  // development only
  if ('development' == app.get('env')) {
    app.use(express.errorHandler());
  }
  
  app.get('/', routes.index);
  app.get('/users', user.list);
  
  app.post('/new_lsystem', function(req, res) {
    var rp = new RuleParser(req.body.rules);
    var alphabet = req.body.alphabet.split(', ');
    var angle = parseFloat(req.body.angle);
    var rules = rp.parse();
    var lsys = new LSystem(alphabet, req.body.axiom, rules);
    lsys.set_angle(angle);
    lsys.generate(req.body.iterations);
    console.log('[DEBUG] lsys = ' + JSON.stringify(lsys));
    res.render('lsys', {lsys_str: lsys.str, title: 'L-System Drawing'});
  });
  
  http.createServer(app).listen(app.get('port'), function(){
    console.log('Express server listening on port ' + app.get('port'));
  });
  
subject: Remove some debug statements