1518 def R(seqn):  argument
1520     for i in seqn:
1525     def __init__(self, seqn):  argument
1526         self.seqn = seqn
1528         return self.seqn[i]
1532     def __init__(self, seqn):  argument
1533         self.seqn = seqn
1538         if self.i >= len(self.seqn): raise StopIteration
1539         v = self.seqn[self.i]
1545     def __init__(self, seqn):  argument
1546         self.seqn = seqn
1549         for val in self.seqn:
1554     def __init__(self, seqn):  argument
1555         self.seqn = seqn
1558         if self.i >= len(self.seqn): raise StopIteration
1559         v = self.seqn[self.i]
1565     def __init__(self, seqn):  argument
1566         self.seqn = seqn
1573     def __init__(self, seqn):  argument
1574         self.seqn = seqn
1583     def __init__(self, seqn):  argument
1591 def L(seqn):  argument
1593     return chain(imap(lambda x:x, R(Ig(G(seqn)))))