Assuming that the keenest insights can be gained by comparing systems with large differences, the Italian and United States systems are good candidates.
The Italian and United States systems are very different.
The United States and Italian systems are nearly identical.
I have no concept of it, not even an abstract one.
A  man is snowboarding on a green snowboard.
A man is sitting on a bench.
The man is near the chalkboard.
Publicity is a hard thing to master, which is why there have been no books penned about it.
the women are naked