     private let maxLetterSize:CGSize
     private let deltaUpperCase:UInt32
     private let deltaLowerCase:UInt32
+    private let kSpeedY:CGFloat = -1
     private let kFontSize:CGFloat = 20
     private let kMaxLetterWidth:CGFloat = 300
     private let kMaxLetterHeight:CGFloat = 30

                    positionY:positionY,
                    width:width,
                    height:height)
                items.append(item)
            }
        }
    }
    
    func draw(context:CGContext)

        
        if shoudlAddItem == 0
        {
            if self.items.count < kMaxItems
            {
                guard
                    
