int prefixLength = Integer.parseInt(args[0]);
BugCollection origCollection = new SortedBugCollection();
if (args.length == 1) {
origCollection.readXML(System.in);
} else {
origCollection.readXML(args[1]);
}
Map<String, Integer> map = new TreeMap<String, Integer>();
Map<String, Integer> ncss = new TreeMap<String, Integer>();
for (BugInstance b : origCollection.getCollection()) {