Removing Duplicates (Advanced)

Hello --

Attached is a workbook that has two different tabs in which I need help removing duplicates, both based on different criteria.

Tab "Example1" :
I want column D to say "Keep" if B=C
I want column D to say "Keep" if B is Blank and C has a date


Tab "Example2":
There are duplicate values here based on column A
If B is Blank and C has a date, keep that row and remove the other rows associated to that same unique key in column A
If both B and C has a date, delete rows associated to those with the same matching unique key in column A

Attached is the example.