package innovimax.mixthem.operation;

interface ILineOperation implements IOperation {
	public String process(String line1, String line2);
}

@@ -29,16 +29,55 @@
 eration;
+%0Aimport innovimax.mixthem.MixException;
 %0A%0Ainterf
@@ -169,12 +169,32 @@
 g line2)
+ throws MixException
 ;%0A%7D%0A

Update ILineOperation.java