Spelling after ж, ш, ч, щ, ц
Apply the у spelling rule after Russian sibilants without confusing it with stem formation.
After ж, ш, ч, щ, ц, Russian writes у rather than ю in these endings: пишу, пишут.
- писа- → пиш- is a stem change.
- ш + у is an orthographic requirement.
- Keep morphology and spelling as separate steps.
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