diff --git a/src/encoding/block.cpp b/src/encoding/block.cpp
index 7306276..d15b7af 100644
--- a/src/encoding/block.cpp
+++ b/src/encoding/block.cpp
@@ -306,6 +306,7 @@ Block::reset()
 
   m_type = std::numeric_limits<uint32_t>::max();
   m_begin = m_end = m_value_begin = m_value_end = Buffer::const_iterator();
+  std::cout << this << " RESET Size of Sub block container: " << m_subBlocks.size() << std::endl;
 }
 
 void
@@ -346,6 +347,8 @@ Block::parse() const
                                   element_begin, element_end,
                                   begin, element_end));
 
+      std::cout << this << " PUSH_BACK1 Size of Sub block container: " << m_subBlocks.size() << std::endl;
+
       begin = element_end;
       // don't do recursive parsing, just the top level
     }
@@ -431,6 +434,7 @@ Block::remove(uint32_t type)
   auto it = std::remove_if(m_subBlocks.begin(), m_subBlocks.end(),
                            [type] (const Block& subBlock) { return subBlock.type() == type; });
   m_subBlocks.resize(it - m_subBlocks.begin());
+  std::cout << this << " REMOVE Size of Sub block container: " << m_subBlocks.size() << std::endl;
 }
 
 Block
@@ -540,11 +544,16 @@ Block::erase(Block::element_const_iterator position)
   resetWire();
 
 #ifdef NDN_CXX_HAVE_VECTOR_INSERT_ERASE_CONST_ITERATOR
-  return m_subBlocks.erase(position);
+  element_iterator i1 = m_subBlocks.erase(it);
+  std::cout << this << " ERASE Size of Sub block container: " << m_subBlocks.size() << std::endl;
+  return i1;
 #else
   element_iterator it = m_subBlocks.begin();
   std::advance(it, std::distance(m_subBlocks.cbegin(), position));
-  return m_subBlocks.erase(it);
+
+  element_iterator i2 = m_subBlocks.erase(it);
+  std::cout << this << " ERASE Size of Sub block container: " << m_subBlocks.size() << std::endl;
+  return i2;
 #endif
 }
 
@@ -560,7 +569,10 @@ Block::erase(Block::element_const_iterator first, Block::element_const_iterator
   element_iterator itEnd = m_subBlocks.begin();
   std::advance(itStart, std::distance(m_subBlocks.cbegin(), first));
   std::advance(itEnd, std::distance(m_subBlocks.cbegin(), last));
-  return m_subBlocks.erase(itStart, itEnd);
+
+  element_iterator i = m_subBlocks.erase(itStart, itEnd);
+  std::cout << this << " ERASE Size of Sub block container: " << m_subBlocks.size() << std::endl;
+  return i;
 #endif
 }
 
@@ -569,6 +581,7 @@ Block::push_back(const Block& element)
 {
   resetWire();
   m_subBlocks.push_back(element);
+  std::cout << this << " PUSH_BACK2 Size of Sub block container: " << m_subBlocks.size() << std::endl;
 }
 
 Block::element_iterator
@@ -577,11 +590,15 @@ Block::insert(Block::element_const_iterator pos, const Block& element)
   resetWire();
 
 #ifdef NDN_CXX_HAVE_VECTOR_INSERT_ERASE_CONST_ITERATOR
-  return m_subBlocks.insert(pos, element);
+  element_iterator i1 = m_subBlocks.insert(pos, element);
+  std::cout << this << " INSERT Size of Sub block container: " << m_subBlocks.size() << std::endl;
+  return i1;
 #else
   element_iterator it = m_subBlocks.begin();
   std::advance(it, std::distance(m_subBlocks.cbegin(), pos));
-  return m_subBlocks.insert(it, element);
+  element_iterator i2 = m_subBlocks.insert(it, element);
+  std::cout << this << " INSERT Size of Sub block container: " << m_subBlocks.size() << std::endl;
+  return i2;
 #endif
 }