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This exception has no message.
java.lang.NullPointerException: 	at undefined.SlotMachine.isWinner(	at undefined.Play1000SlotMachines.main(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at com.intellij.rt.execution.application.AppMain.main(