Trying the count function for multi select in subform and also removing already selected employees

Trying the count function for multi select in subform and also removing already selected employees

Good morning, 

I am try to count the recurring employees under the "Employees Assigned" subform field. I have the initial count working for a single row like seen here 


And this is the deluge code I have to make this work.


I have tried putting something similar to this in the on add new row for the subform but can't get it to work. It starts recounting as I select more employees.
Example.



My last request is to remove the employee names from the list after they have already been selected in the "Employees Assigned" field. I don't want any employee being selected more than once. Can you help me with the easiest way to achieve this? I would guess to use the :removeall() and/or :add but I still can not figure it out. Help is greatly appreciated. 

I tried this but this did not work for me.



Thank you.