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Tonight on TV

Roots: Celebrating 25 Years (7 p.m., Ch. 5): See accompanying story.

Sabrina the Teenage Witch (7 p.m., Ch. 30): Sabrina's evil twin is e-mailing her.

Raising Dad (7:30 p.m., Ch. 30): Emily isn't happy that her dad is dating.

First Monday (8 p.m., Ch. 2): The show moves to its regular timeslot.

Now with Bill Moyers (8 p.m., Ch. 7): The debut of this PBS newsmagazine.

Reba (8 p.m., Ch. 30): Reba's parents celebrate their anniversary.

20/20 (9 p.m., Ch. 4): The show returns to this timeslot.

Law & Order: SVU (9 p.m., Ch. 5): The detectives investigate a double murder and dismemberment.