Consider the transaction graph in the figure below: rectangles represent transactions, empty circles represent fresh addresses, and filled in circles represent addresses controlled by the named entity $($i$.$e$.,$A$$ stands for Alice, $$B$$ stands for Bob, and $$C$$ stands for Carol$).$ An edge labeled $$change$$ means that the end node is the change address for that transaction, as identified by the idioms of use discussed in class. Note that not every transaction has an identified change address.