The slide is talking about all possible values of keys. It's important to realize that in your hashmap, you only have a subset of keys at any given time. Regardless of how good your hash function is, you might be lucky in how those keys map to buckets, or you might be not.
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.