So, a program asks for 3 letters, without specifying a chair letter. My chair letter comes from someone I have met once and frankly didn't seem to like me very much. It is likely the weakest of my 4 letters. So do I submit my 2 strongest letters plus the chair? 3 strong letters without the chair? Or just stop ****ing overthinking it and just submit all 4 letters to all the programs that ask for 3 without specifying a chair?