My father urged me to take the risk and fight the machine and gave his blessing.

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Cash is expensive not merely because of the risk of being robbed at the cash machine or losing your savings to a fire, flood or abusive spouse.

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But in some cases it was the creator of the machine image who was put at risk by leaving private keys on the server or failing to completely erase his or her own data before publishing it for customers to use, Balduzzi says.

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