In all of these applications, what you're doing is cutting a tongue (or a tenon) to lit in a dado.
FULL THROUGH DADO. But why use a tongue and dado at all? If you're joining :;helves to the sides cf a cabinet, why not save time and cut the dado to width ¡a match the thickness cf the shelves; :iee "Full Through Dado" photo above. This way you wouldn't have the extra step cf cutting a tongue to fit the dado.
The problem is that there can be ¡slight variations in thicknessacross the width cf a shelf, or if s warped slightly. Then the dado is cut to fit the thickest part cf the shelf, or it's cut a little too Ride to accommodate the warp. So
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