1620 def R(seqn):  argument
1622     for i in seqn:
1627     def __init__(self, seqn):  argument
1628         self.seqn = seqn
1630         return self.seqn[i]
1634     def __init__(self, seqn):  argument
1635         self.seqn = seqn
1640         if self.i >= len(self.seqn): raise StopIteration
1641         v = self.seqn[self.i]
1647     def __init__(self, seqn):  argument
1648         self.seqn = seqn
1651         for val in self.seqn:
1656     def __init__(self, seqn):  argument
1657         self.seqn = seqn
1660         if self.i >= len(self.seqn): raise StopIteration
1661         v = self.seqn[self.i]
1667     def __init__(self, seqn):  argument
1668         self.seqn = seqn
1675     def __init__(self, seqn):  argument
1676         self.seqn = seqn
1685     def __init__(self, seqn):  argument
1693 def L(seqn):  argument
1695     return chain(map(lambda x:x, R(Ig(G(seqn)))))