try: from ppn_all import *
except ImportError: raiseException('ppn_all.py missing')

try: # computer
  from ppn_cp import *
except ImportError:
  try: # Casio USB Power Graphic 3
    from ppn_cas import *
  except ImportError:
    try: # 83P/84+ CE Python Edition
      from ppn_ce import *
    except ImportError:
      try: # NumWorks
        from ppn_nw import *
      except ImportError:
        try: # Ndless
          from ppn_ns import *  
        except ImportError:
          raise Exception('device ppn_?.py missing')