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## Hints To complete this exercise you need to implement the following functions: - `openAccount` - Called at the start of each test. Returns a BankAccount. - `closeAccount` - Called at the end of each test. - `getBalance` - Get the balance of the bank account. - `updateBalance` - Increment the balance of the bank account by the given amount. The amount may be negative for a withdrawal. The initial balance of the bank account should be 0. You will find a dummy data declaration and type signatures already in place, but it is up to you to define the functions and create a meaningful data type, newtype or type synonym.
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