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\begin{tikzpicture}
\begin{class}[text width=5cm]{BankAccount}{0,0}
\attribute{owner : String}
\attribute{balance : Dollars = 0}
\operation{deposit(amount : Dollars)}
\operation[0]{withdrawl(amount : Dollars)}
\end{class}
\begin{class}[text width=7cm]{CheckingAccount}{-5,-5}
\inherit{BankAccount}
\attribute{insufficientFundsFee : Dollars}
\operation{processCheck ( checkToProcess : Check )}
\operation{withdrawal ( amount : Dollars )}
\end{class}
\begin{class}[text width=7cm]{SavingsAccount}{5,-5}
\inherit{BankAccount}
\attribute{annualInteresRate : Percentage}
\operation{depositMonthlyInterest ( )}
\operation{withdrawal ( amount : Dollars )}
\end{class}
\end{tikzpicture}
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