How would you cut this?

I need to cut two dead-on parallel through slots in a piece of plywood.

I've tried a couple of approaches with the router, but can't seem to clamp them sturdy enough to stay put while the router hogs out the slots.

I've got a drill press, router, table saw, and a mortiser. The slots are about six inches long and I have to do several, so I hope to avoid the mortiser.

Thanks in advance.

Where's the smart pills??
 

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Router table. Adjust fence to desired depth.
Mark a start/stop point on your fence.
Start by plunging the material down onto the table.
 
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