diff --git a/contrib/moses2/ArcLists.cpp b/contrib/moses2/ArcLists.cpp
index 36e86b433..edc985465 100644
--- a/contrib/moses2/ArcLists.cpp
+++ b/contrib/moses2/ArcLists.cpp
@@ -5,6 +5,7 @@
  *      Author: hieu
  */
 #include <iostream>
+#include <sstream>
 #include <algorithm>
 #include <boost/foreach.hpp>
 #include "ArcLists.h"
@@ -114,5 +115,15 @@ void ArcLists::Delete(const HypothesisBase *hypo)
 	delete arcList;
 }
 
+std::string ArcLists::Debug(const System &system) const
+{
+	stringstream strm;
+	BOOST_FOREACH(const Coll::value_type &collPair, m_coll){
+		const ArcList *arcList = collPair.second;
+		strm << arcList << "(" << arcList->size() << ") ";
+	}
+	return strm.str();
+}
+
 }
 
diff --git a/contrib/moses2/ArcLists.h b/contrib/moses2/ArcLists.h
index 2a73554e1..db606401f 100644
--- a/contrib/moses2/ArcLists.h
+++ b/contrib/moses2/ArcLists.h
@@ -10,6 +10,7 @@
 
 namespace Moses2
 {
+class System;
 
 class HypothesisBase;
 
@@ -28,6 +29,7 @@ public:
 
   const ArcList &GetArcList(const HypothesisBase *hypo) const;
 
+  std::string Debug(const System &system) const;
 protected:
   typedef boost::unordered_map<const HypothesisBase*, ArcList*> Coll;
   Coll m_coll;
diff --git a/contrib/moses2/SCFG/KBestExtractor.cpp b/contrib/moses2/SCFG/KBestExtractor.cpp
index f6ebf2689..f5d46cc30 100644
--- a/contrib/moses2/SCFG/KBestExtractor.cpp
+++ b/contrib/moses2/SCFG/KBestExtractor.cpp
@@ -288,6 +288,8 @@ KBestExtractor::KBestExtractor(const SCFG::Manager &mgr)
 				break;
 			}
 
+			cerr << "RANGE=" << startPos << " " << phraseSize << endl;
+
 			const Stack &stack = stacks.GetStack(startPos, phraseSize);
 			const Stack::Coll &allHypoColl = stack.GetColl();
 			BOOST_FOREACH(const Stack::Coll::value_type &valPair, allHypoColl) {
diff --git a/contrib/moses2/SCFG/Manager.cpp b/contrib/moses2/SCFG/Manager.cpp
index 8d12192a0..aeb483aef 100644
--- a/contrib/moses2/SCFG/Manager.cpp
+++ b/contrib/moses2/SCFG/Manager.cpp
@@ -387,6 +387,7 @@ std::string Manager::OutputNBest()
   //Moses2::FixPrecision(out);
 
   arcLists.Sort();
+  //cerr << "arcs=" << arcLists.Debug(system) << endl;
 
   KBestExtractor extractor(*this);
   extractor.OutputToStream(out);