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Below is some code I wrote a while ago for an application that had been written in Perl.I was in a situation where I had to track dependencies on user actions. As an example:This action. . .Can NOT be completed before these actionsaction_4action_1, action_2, action_3action_3action_2action_2action_1But of course I wanted to give the user the power to specify any action they wanted. (including a list of actions) So, if the code was told to do ‘action_4’, it would look that action up, see that actions 1, 2, and 3 needed to be completed first, and then do them.