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I think when you evaluate

mot=Word('y1')

it treats 'y' and '1' as separate characters, giving a word of length 2. Instead,

mot=Word(['y1'])

makes it have length one. To force it to live in Mots, do this:

sage: mot = Mots(Word(['y1']))
sage: Word(['y1']) in Mots
False
sage: Mots(Word(['y1'])) in Mots
True

Not ideal, but it seems to work.