Countif and Countifs

Hopefully some of you who replied will read this again, because things have gotten more complicated and I need more help. To explain better, I have been put in charge of an ophthalmology clinic schedule, and I have to use an Excel workbook that I inherited. I need formulas that will tell me how many providers (doctors) are in clinic on any given morning, afternoon, and evening.

I have attached an example workbook for the first few weeks of February. In column AA I need the total number of cells from columns C,F,I,L,O,R,U, and X that have a "C","D","P", or "N" in them... but that does NOT count any that have "NICU". The same needs to be done for PM and EVE clinic columns AB and AC. So it is similar to my previous question, but it needs to count more different letters. If it might help I manually counted the correct numbers and included them to be able to double check the formulas (hopefully I won't miscount any).
Thanks again in advance!