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Insolent schoolkids and educators with the stamina and sensitivity to reach them is a sentimental formula so familiar, it could stand a pantsing in the hallway between classes.

Which makes it a good thing that “Steve,” starring Cillian Murphy as a dedicated, troubled head teacher at a struggling reform school for chaos-inclined teenage boys, brings a raucously corrective attitude to bear.

Teachers are sorely undervalued in this world, and a more thorny, realistic view of the profession’s challenges has made its way into the culture of late, between the Oscar-nominated German film “The Teachers’ Lounge,” Hirokazu Kore-ada’s “Monster” and Netflix’s Emmys-gobbling hit “Adolesce

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