old_contents: 
  def enum(*sequential, **named):
      enums = dict(zip(sequential, range(len(sequential))), **named)
      reverse = dict((value, key) for key, value in enums.iteritems())
      enums['reverse_mapping'] = reverse
      return type('Enum', (), enums)
  
  Facelet = enum('U1', 'U2', 'U3', 'U4', 'U5', 'U6', 'U7', 'U8', 'U9', 'R1', 'R2', 'R3', 'R4', 'R5', 'R6', 'R7', 'R8', 'R9', 'F1', 'F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', 'D1', 'D2', 'D3', 'D4', 'D5', 'D6', 'D7', 'D8', 'D9', 'L1', 'L2', 'L3', 'L4', 'L5', 'L6', 'L7', 'L8', 'L9', 'B1', 'B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B9')
  
  Color = enum('U', 'R', 'F', 'D', 'L', 'B')
  
  Corner = enum('URF', 'UFL', 'ULB', 'UBR', 'DFR', 'DLF', 'DBL', 'DRB')
  
  Edge = enum('UR', 'UF', 'UL', 'UB', 'DR', 'DF', 'DL', 'DB', 'FR', 'FL', 'BL', 'BR')
  
new_contents: 
  def enum(*sequential, **named):
      enums = dict(zip(sequential, range(len(sequential))), **named)
      reverse = dict((value, key) for key, value in enums.iter())
      enums['reverse_mapping'] = reverse
      return type('Enum', (), enums)
  
  Facelet = enum('U1', 'U2', 'U3', 'U4', 'U5', 'U6', 'U7', 'U8', 'U9', 'R1', 'R2', 'R3', 'R4', 'R5', 'R6', 'R7', 'R8', 'R9', 'F1', 'F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', 'D1', 'D2', 'D3', 'D4', 'D5', 'D6', 'D7', 'D8', 'D9', 'L1', 'L2', 'L3', 'L4', 'L5', 'L6', 'L7', 'L8', 'L9', 'B1', 'B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B9')
  
  Color = enum('U', 'R', 'F', 'D', 'L', 'B')
  
  Corner = enum('URF', 'UFL', 'ULB', 'UBR', 'DFR', 'DLF', 'DBL', 'DRB')
  
  Edge = enum('UR', 'UF', 'UL', 'UB', 'DR', 'DF', 'DL', 'DB', 'FR', 'FL', 'BL', 'BR')
  
subject: Change iteritems for iter