#!/usr/local/bin/python2
from itertools import chain, starmap
from operator import attrgetter
get_mro = attrgetter('__mro__')

class A(object): pass
class B(A): pass
class C(object): pass
class D(C): pass
class E(B, D): pass

for base in chain(*(base.__mro__ for base in E.__bases__)):
  print base

for n in chain('ABC', 'DEF'):
  print n