old_contents: 
  from envi.archs.arm import *
  
  import disasm as th_disasm
  
  class Thumb16Module(ArmModule):
  
      def __init__(self):
          ArmModule.__init__(self, name='thumb16')
          self._arch_dis = self._arch_thumb_dis
  
  
  class ThumbModule(ArmModule):
  
      def __init__(self):
          ArmModule.__init__(self, name='thumb')
          self._arch_dis = self._arch_thumb_dis
  
  
  
new_contents: 
  from envi.archs.arm import *
  
  import disasm as th_disasm
  
  class Thumb16Module(ThumbModule):
  
      def __init__(self):
          ThumbModule.__init__(self, name='thumb16')
  
  
subject: unify the ThumbModule.