Shelves of 3/4 ply, need to have dividers every 2"

The supply store did not have anything like traditional 1/4 HB for the
dividers, I ended up buying some 3/16 ply to use. Maybe a mistake.

How would you cut a 3/16 groove in the 3/4 boards? (I need them every 2",
making a total of 32 slots)

My sawblade is 1/8, my smallest router bit is 1/4 sigh

Suggestions please!

markndawoods