sage

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gh-40992: some details in words/morphic.py just pep8 cleanup, some typing annotations, and some code details ### :memo: Checklist - [x] The title is concise and informative. - [x] The description explains in detail what this PR is about. URL: https://github.com/sagemath/sage/pull/40992 Reported by: Frédéric Chapoton Reviewer(s): David Coudert