Plywooddado router-bit question

A dado wood joint features a rectangular slot cut across the grain of a piece of wood, into which another piece fits snugly

The PERFECT Dado Jig: A dado is a very common type of joinery in woodworking It's super simple to make and the joint is very strong

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slot no Yesterday I cut a dadoslot in the backboard I wasn't sure I would do it right but the end result is what I need