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java.lang.NullPointerException at com.test.ds.Comp.compare(Main.java:12) at com.test.ds.Comp.compare(Main.java:1) at java.util.Arrays.mergeSort(Arrays.java:1284) at java.util.Arrays.sort(Arrays.java:1223) at java.util.Collections.sort(Collections.java:159) at com.test.ds.TupleList.sort(TupleList.java:20) at com.test.ds.Main.main(Main.java:38)