is "            Commands:
            ------------------------------------
            ?        display this help
            q        Quit this simulator
            T        display current Time
            t <i>    add <i> minutes to the current time
            a        Arrival of a new car into the parking
            d <i>    Departure of the car number <i>
            l <i>    number of cars at Level <i>
            H [<x>]  display / change Hour parking price with <x>
            c        total Count of cars in the whole parking
            ------------------------------------
"
					constant attribute
					{}