On Saturday's lunch rush at Ada's diner, they sold 255 sandwiches.  Of those sandwiches sold: 75 sandwiches included turkey 36 sandwiches included sprouts 25 sandwiches included both turkey and cheese 10 sandwiches included turkey and sprouts 6 sandwiches included both cheese and sprouts 3 sandwiches included all three ingredients 17 sandwiches had none of these ingredients (turkey, cheese, or sprouts) How many sandwiches only included cheese (of these three ingredients)?

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