As can be seen from the documentation of DELETE it can take two FROM clauses.
You can constrain the set of records you want to delete by more than one table. The second from just generates the alias C for the table you delete from, joins it with the table #common and deletes only records which have a record in talbe #common.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.