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hello and welcome to the part number 20 my name is Paula - Paula from lynda.com and today we will finalize the undo and three Rajic look at that this is the final result we are going to do some operations we will press ctrl-z and look at that we are moving in the history and when I do control shift set I will go back the history which is awesome isnamp;#39;t that cool so letamp;#39;s start coding okay so now we go and implement creating history stamp and restoring the history stamp itself so we are going to return history stamp the history stamp is gonna be an object dictionary wait a scription she is gonna be our desk a snapshot which is gonna be our whole scene see realized so so that scene not sterilized and then we are going also pastors selection which is going to be another object so letamp;#39;s call it cell obj and cell obj is gonna be another dictionary with the list of selected nodes and selected edges like this and because our since relation doesnamp;#39;t actual
