The part of the question that gives us the most information is that we're looking for a contrast, or a way of comparison. So imagine you want to compare a big and a small elephant, you could say :
<span>although one is big, the other one is small one is big which is good, conversely the other one is small which is also not bad one is big, however, the other one is small An elephant is big. in contrast that one is small
So we see that all four of them can be used to express contrast!
Ben is Willy's adventurous and lucky older brother. Of course, he's dead, so he only appears in the play as a character in Willy's troubled imagination. Willy totally idolizes Ben because he was an adventurer who escaped the world of business and got rich quick by finding diamonds in the African jungle