interpreter pattern class hourones(object)pass class minutes(object)pass class minutetens(object)pass class minuteones(object)pass class itemcondition(object)pass class number(object)pass class digit(object)pass class customercondition(object)pass not all of these classes will be needed in the final designand as such you should pay attention to the yagni principlebasicallythe idea is that you should not build things you are not going to need in this casei have written them all out so you can see that we took every single thing mentioned in the process of defining the grammar and created class for each before we reduce the classes and create the final internal dslwe are going to touch on the composite patternwhich will be useful when we start building our interpreter composite pattern when you have container with elements that could themselves be containersyou have good case for using the composite pattern look at the ebnf version of the grammar we are developing for the restaurantan item can be combo that contains items