ion is path sensitive and every possible path through 
  the program is explored. The explored execution traces are represented with 
  <a href="http://clang.llvm.org/doxygen/classclang_1_1ento_1_1ExplodedGraph.html">ExplodedGraph</a> object.
  Each node of the graph is 
  <a href="http://clang.llvm.org/doxygen/classclang_1_1ento_1_1ExplodedNode.html">ExplodedNode</a>, 
  which consists of a <tt>ProgramPoint</tt> and a <tt>ProgramState</tt>.
  <p>
  <a href="http://clang.llvm.org/doxygen/classclang_1_1Progr