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This exception has no message.
java.lang.UnsupportedOperationException: 	at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$1.remove(	at java.util.AbstractMap.remove(	at Test.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(