For some Boston parents, the list of next school year’s “bell times” dropped like a bomb Thursday night.

This year, the opening bell at the Henderson School in Dorchester rings at 8:30 a.m. Next year, it will ring at 7:15. And that will make mornings tough on the family of 3-year-old Lucy Karp, who’s enrolled in pre-kindergarten at the Henderson.

As they have redrawn bus routes and now school schedules, Boston Public Schools officials have called attention to the fact that every child’s trip to school involves a lot of variables. But Lucy’s case is even more complex than most.

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