cell coloring

[grey_hair]

I’m trying to set a School program for teachers only
Frankly speaking I don’t know how to make it in Excel. What I, trying to do?
1. Let’s have 3 teachers -Peter, Rick and Bill
2. When Peter takes first school hour, when name is written, the cell turns for example yellow. The same with other teachers but different color for each one.
3. When there is duplicate of names (in rows only), cells of duplicate names to turn into some other color. When duplicate is deleted, cell returns to original teacher’s color. I attach herewith a sample Excel file Sheet 1 shows green when there is duplicate, Sheet 2 shows what I would like to do.

So far I succeeded with conditional formatting to color duplicates (sheet 1) with formula
=COUNTIF ($F4:$L4;F4)>1 , turning cell green. And that’s it. I’m stuck.
Kindly ask you to help me.