Using inherited methods
Sending deposit: or withdraw: uses the original methods,
which still work, despite changing balance and balance: to methods.
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Using the methods inherited from the bank account traits
We can now also try depositing and withdrawing funds from the stock account.
We will be using the deposit: and withdraw: methods from the bank account traits,
as we have not altered the stock account's parent.
Note that although these methods were created when the balance and balance:
messages accessed and set a data slot, they still do the right thing because we have
provided suitable implementations in the child.
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