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The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The variable 'changed' is assigned but its value is never used

The variable 'num' is assigned but its value is never used

The variable 'num2' is assigned but its value is never used

The variable 'num3' is assigned but its value is never used

The variable 'num4' is assigned but its value is never used

The variable 'e' is declared but never used

The variable 'e' is declared but never used

The variable 'test' is assigned but its value is never used