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What circumstances would come up that would cause Germany and Austria to go to war, preferably around 1881?

I had the idea for that alternate history pet project, where Germany and Austria somehow go to war. Germany annexes Austria and the Sudentenland, while new countries, Hungary, Slovenia, and Bosnia, come up. This somehow leads to that Yugoslav Union thing.

Any idea about how by any means short of intervention by the Alien Space Bats, could Germany and Austria-Hungary go to war?
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