Useless abstractions

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This task is, well, just like modern art on Planet Fifties': It's full of useless abstractions, and then strict realism is used where abstractions would have made sense. As you've probably already guessed, we've given you a brainteaser: You need to place the abstract keyword in the right places so that the program will compile.
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Level 23 , Columbia, United States
3 August 2020, 03:30
So the SwimmingPegasus class is abstract because you're not going to create any instances of it?