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    /*
    Let's say you are taking college courses
    You have n courses
    You have e list of dependencies (A, B)
    A = course
    B = course that A depends on, meaning B must finish first before A can be taken
    there can be independent courses
    there can also be multiple dependencies

    design and write an implementation to determine if you can finish all courses?

    run your code on test cases

    A
   /|\
  B | C
   \ /
    D

    E
   / \
  F   G
     */