2010/3/28 Vincent Delecroix <20100.delecr...@gmail.com>:
> Hello Sebastien, hello combinat-words dev, hello combinat team,
>
> In the same vein
>
> {{{
> sage: t = WordMorphism({'a1' : ['a2'], 'a2': ['a1']})
> sage: w = Word(['a1','a2'])
> sage: w.is_palindrome(t)
> Traceback
> ...
> KeyError 'a'
> }}}

http://trac.sagemath.org/sage_trac/ticket/8618

needs review!

Sébastien

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