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sclass LineComp_PairCounts { new MultiSet> counts; MultiSetMap> byCount = multiSetMap_innerTreeSet_outerRevTreeMap(); void addAll(Iterable> l) { fOr (Pair p : l) add(p); } // increment pair's count void add(Pair p) { int count = counts.get(p); byCount.remove(count, p); counts.add(p); byCount.put(count+1, p); } // decrement pair's count void remove(Pair p) { int count = counts.get(p); if (count == 0) fail("Can't remove pair " + p); byCount.remove(count, p); counts.add(p); if (count-- > 0) byCount.put(count, p); } Pair mostPopularDuplicate() { ret toInt(firstKey(byCount)) < 2 ? null : firstValue(byCount); } int numberOfDuplicates() { ret counts.size()-l(byCount.get(1)); } int getCount(Pair p) { ret counts.get(p); } }